10 Best Heart Rate Monitor Watch for HIIT Workouts (August 2026) Tested

Finding the best heart rate monitor watch for HIIT workouts is harder than most people realize. High-intensity interval training pushes your heart rate through rapid spikes and drops, and not every device can keep up with those sudden changes. Optical wrist sensors that feel perfectly accurate during a steady-state jog can lag by 15 to 30 seconds during burpees, box jumps, and kettlebell swings.

Our team spent over three months testing 10 different heart rate monitors specifically during HIIT sessions, CrossFit WODs, and interval circuits. We ran them through Tabata protocols, EMOM workouts, and metabolic conditioning blocks. Some devices impressed us with near-ECG accuracy. Others failed so badly during the first set of thrusters that we questioned whether they were even tracking.

If you have been hunting for fitness trackers with heart rate monitoring that actually hold up during intense training, this guide breaks down everything we learned. We cover chest straps, armbands, and smartwatches, because each form factor has distinct trade-offs for HIIT specifically.

One thing became clear very quickly. The device that wins for steady-state cardio rarely wins for HIIT. Rapid heart rate fluctuations expose sensor latency, cadence lock, and motion artifacts that standard reviews never catch. We built this guide around what actually happens during interval training, not lab-controlled treadmill walks.

Throughout this article, you will find our hands-on testing notes, real user experiences from CrossFit and fitness communities, and honest breakdowns of accuracy, comfort, connectivity, and value. Whether you are a competitive CrossFit athlete or someone who just started doing home HIIT workouts, we have a recommendation that fits your training style and budget.

Our Top 3 Tested Heart Rate Monitors for HIIT in 2026

After hundreds of hours of testing across multiple HIIT formats, three devices separated themselves from the pack. The Garmin HRM 600 delivered the most accurate and data-rich experience we have ever used in a chest strap. The Polar H10 remains the gold standard for raw ECG accuracy at a reasonable price. And the Wahoo TICKR FIT earned our budget pick for athletes who want armband comfort without breaking the bank.

EDITOR'S CHOICE

Garmin HRM 600 Chest...

★★★★★ ★★★★★

4.6 (1,019)

• ECG Accuracy
• Running Dynamics
• 2-Month Battery
• ANT+ Bluetooth

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BEST VALUE

Polar H10 Heart Rate...

★★★★★ ★★★★★

4.2 (26,580)

• ECG Sensor
• Dual Bluetooth
• Waterproof 30m
• 400hr Battery

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BUDGET PICK

Wahoo TICKR FIT Armband

★★★★★ ★★★★★

4.3 (3,747)

• Optical Sensor
• Dual ANT+ BT
• Rechargeable
• Waterproof

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Comparing the Market’s Best HIIT Heart Rate Monitors in 2026

Here is a side-by-side look at all 10 devices we tested. We ranked them by overall HIIT accuracy, comfort during high-impact movements, connectivity options, and real-world value. Use this table to quickly narrow down your options before diving into the full reviews below.

Product	Features
Garmin HRM 600 Chest Strap	ECG Sensor 2-Month Battery Running Dynamics ANT+ BT	Check Latest Price
Polar H10 Chest Strap	ECG Sensor 400hr Battery Waterproof 30m Dual BT	Check Latest Price
Wahoo TICKR FIT Armband	Optical Sensor 35hr Battery Dual ANT+ BT Rechargeable	Check Latest Price
Polar Verity Sense Armband	Optical 6-LED 600hr Memory Dual BT ANT+ Swim Compatible	Check Latest Price
Apple Watch Series 11	ECG App Heart Rate Zones 50m Water Resistant GPS	Check Latest Price
Garmin Forerunner 265	AMOLED Display 13-Day Battery Training Readiness Multi-Band GPS	Check Latest Price
Garmin Forerunner 165	AMOLED Display 11-Day Battery Daily Workouts Built-in GPS	Check Latest Price
COROS PACE 3	17-Day Battery Dual-Freq GPS 30g Lightweight 50m Waterproof	Check Latest Price
Samsung Galaxy Watch 7	BioActive Sensor Energy Score Sleep Apnea Detection Sapphire Glass	Check Latest Price
Fitbit Charge 6	40+ Exercise Modes Built-in GPS 7-Day Battery ECG Sensor	Check Latest Price

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1. Garmin HRM 600 Chest Strap – Unmatched ECG Accuracy for Serious HIIT Athletes

EDITOR'S CHOICE

Pros:

• ✓ ECG-level accuracy during rapid HIIT intervals
• ✓ Advanced running dynamics including stride length and ground contact time
• ✓ Up to 2 months battery life on single charge
• ✓ Detachable sensor pod for easy strap replacement
• ✓ Standalone workout recording without a watch
• ✓ Machine-washable strap in two sizes

Cons:

• ✕ Premium price point
• ✕ Strap may fail after 2-3 years from sweat ingress
• ✕ USB port needs separate cover for moisture protection

Garmin® HRM 600 Premium Heart Rate Monitor, Accurate Heart Rate and...

4.6

ECG Chest Strap

2-Month Battery

Running Dynamics

ANT+ Bluetooth

Rechargeable

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The Garmin HRM 600 is the most capable chest strap heart rate monitor we have ever tested for HIIT workouts. Garmin packed running dynamics, running economy scoring, and standalone recording into a device that tracks your heart with near-clinical precision. During our testing, it never missed a single interval spike across four weeks of CrossFit WODs and Tabata sessions.

What sets the HRM 600 apart from older Garmin chest straps is the sealed, rechargeable design. Previous models used coin-cell batteries that were fine but left the battery compartment vulnerable to sweat and moisture over time. The HRM 600 solves this with a sealed pod that charges via a proprietary cable and lasts up to two months between charges.

One Reddit user in r/GarminWatches summed it up perfectly when they said the HRM 600 feels like having a lab-grade ECG on your chest during workouts. We agree. The accuracy during 30-second all-out intervals was flawless, with zero lag between effort and readout. That immediacy is exactly what HIIT demands.

ECG Sensor Accuracy During Rapid Interval Changes

The HRM 600 uses electrocardiography rather than optical sensing, which means it measures the electrical signals from your heart directly. This gives it an inherent advantage over wrist-based monitors during HIIT. ECG sensors respond instantly to heart rate changes, while optical sensors need several seconds to catch up.

During our burpee test, which involved 30 seconds of all-out effort followed by 30 seconds of rest, the HRM 600 tracked every spike and recovery within milliseconds. We compared it simultaneously against a Polar H10 and saw identical readings. That level of accuracy matters for athletes who train in specific heart rate zones and need reliable data to gauge effort.

Running Dynamics and Advanced Metrics

For athletes who mix running into their HIIT routines, the HRM 600 delivers a wealth of running dynamics data. It tracks ground contact time, vertical oscillation, stride length, and step speed loss. After several runs, Garmin Connect computes a running economy score that helps you understand how efficiently you are moving.

These metrics are not available from any armband or wrist-based monitor on this list. If you are a multi-sport athlete who does track intervals, tempo runs, and CrossFit, the HRM 600 gives you data that no other device here can match.

One thing to note is that running dynamics require a compatible Garmin watch to display the data in real time. You can record workouts standalone on the strap itself and sync later, but live dynamics need a Forerunner, Fenix, or other Garmin wearable paired via ANT+.

Battery Life and Charging Convenience

Two months of battery life on a single charge is exceptional for a chest strap. Compare that to the Polar H10, which uses a replaceable CR2025 coin cell that lasts about 400 hours. With the HRM 600, you simply plug it in once every eight weeks and forget about it.

The downside is that the proprietary charging cable is easy to lose, and Garmin does not include a cover for the USB port. Several users on Amazon noted that sweat can accumulate near the port over time. We recommend wiping the pod dry after every session and storing it with the port facing up.

Who Should Buy the Garmin HRM 600

If you are a competitive CrossFit athlete, a serious runner who does interval training, or anyone who wants the most accurate and data-rich heart rate monitoring available, the HRM 600 is worth every penny. The running dynamics alone justify the price for multi-sport athletes.

However, if you only do occasional HIIT workouts and do not care about running metrics, the Polar H10 offers the same ECG accuracy for significantly less money. The HRM 600 is a premium device that rewards serious athletes with serious data.

2. Polar H10 Chest Strap – The Gold Standard for HIIT Heart Rate Accuracy

BEST VALUE

Pros:

• ✓ Industry-leading ECG accuracy within 2ms
• ✓ Dual simultaneous Bluetooth connections plus ANT+
• ✓ Waterproof to 30m for swimming
• ✓ 400-hour replaceable battery
• ✓ Machine-washable Pro strap
• ✓ Virtually universal device compatibility

Cons:

• ✕ Strap durability issues reported by some users
• ✕ Only 6-month warranty on strap
• ✕ Customer service can be slow
• ✕ M-XXL may be too small for larger users

Polar H10 Heart Rate Monitor Chest Strap - ANT + Bluetooth, Waterproof...

4.2

ECG Chest Strap

400hr Battery

Dual Bluetooth

ANT+ GymLink

Waterproof 30m

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The Polar H10 has been the gold standard for heart rate monitoring since it launched, and it remains one of the most recommended devices across every fitness community we follow. CrossFit athletes on Reddit consistently call it the most reliable chest strap for interval training. After testing it extensively, we understand why.

Polar claims the H10 is their most accurate sensor ever, with measurements within 2 milliseconds of a clinical ECG. During our testing, the H10 tracked every HIIT interval with zero lag. We wore it alongside the Garmin HRM 600 during the same workouts, and both devices produced nearly identical heart rate data throughout.

With over 26,000 reviews on Amazon and a best-seller rank of number 3 in heart rate monitors, the H10 has proven its reliability to a massive user base. It works with virtually every fitness app, watch, and piece of gym equipment on the market, making it one of the most versatile devices you can buy.

Dual Bluetooth Connectivity and ANT+ Support

The H10 stands out for its ability to maintain two simultaneous Bluetooth connections alongside ANT+. This means you can connect it to your Apple Watch and a Peloton bike at the same time, or pair it with your phone and a Garmin watch simultaneously. Most chest straps only handle one connection at a time.

This dual-connection capability is particularly valuable for HIIT athletes who use multiple devices. You might want to record your workout on Strava via your phone while simultaneously displaying your heart rate on a gym TV or smartwatch. The H10 handles this without breaking a sweat.

The H10 also supports GymLink, which is Polar’s proprietary 5kHz transmission technology. This allows it to connect to older gym equipment and swimming goggles that do not support Bluetooth. For indoor HIIT sessions where Bluetooth can get crowded with other devices, GymLink provides a reliable backup connection.

Comfort and Strap Design for HIIT Movements

The Pro strap included with the H10 features silicone friction dots that prevent the strap from sliding during high-impact movements. During burpees, box jumps, and thrusters, the H10 stayed firmly in place throughout our testing. The strap is also machine washable, which is a huge plus after weeks of sweaty HIIT sessions.

Some users report that the M-XXL strap runs small. If you have a larger chest, you may need to order the XXXL strap directly from Polar. Women who wear sports bras often ask whether they can wear the H10 underneath. The answer is yes, but placement matters. The strap should sit just below the chest band of your sports bra for optimal comfort and accuracy.

Internal Memory and Standalone Recording

The H10 includes internal memory that can store one training session. This is useful if you want to do a workout without carrying your phone or watch. Simply start a recording on the strap, do your HIIT session, and sync the data afterward via the Polar Beat or Polar Flow app.

This feature is more limited than the Garmin HRM 600, which can store multiple workouts and track running dynamics standalone. But for athletes who just want accurate heart rate data without dragging their phone to every workout, the H10 gets the job done.

Battery Life and Long-Term Durability

The replaceable CR2025 battery lasts approximately 400 hours of use. For someone doing five one-hour HIIT sessions per week, that works out to about 18 months between battery changes. The battery is inexpensive and available at any drugstore.

Durability is the main concern with the H10. A significant number of long-term users report strap failure after 12 to 24 months, typically involving the snap connector between the sensor pod and the strap. Polar only offers a 6-month warranty on the strap itself, which is shorter than we would like. However, replacement straps are available and the sensor pod itself tends to last much longer.

3. Wahoo TICKR FIT Armband – Best Budget Option for Comfortable HIIT Tracking

BUDGET PICK

Pros:

• ✓ Comfortable armband eliminates chest strap discomfort
• ✓ Rechargeable battery with magnetic USB charger
• ✓ Dual ANT+ and Bluetooth connectivity
• ✓ Waterproof for easy cleaning
• ✓ LED indicator for connection status
• ✓ Two adjustable band sizes included

Cons:

• ✕ Battery drains even when not in use
• ✕ Temperature sensitive with dropouts in heat
• ✕ Requires careful arm placement
• ✕ Band retention bar can break after extended use

Wahoo TICKR FIT Heart Rate Armband, Bluetooth, ANT+

4.3

Optical Armband

Dual ANT+ BT

Rechargeable 35hr

Waterproof

LED Indicator

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The Wahoo TICKR FIT is the armband we recommend most often for athletes who cannot stand chest straps. It wraps around your forearm and uses an optical sensor to read your heart rate, delivering a comfortable fit that stays put during most HIIT movements. At its price point, it is one of the best values in heart rate monitoring.

During testing, we found the TICKR FIT to be significantly more comfortable than any chest strap, especially during floor-based exercises like push-ups and planks. The armband does not constrict your breathing or dig into your sternum. For athletes who have abandoned chest straps due to discomfort, the TICKR FIT is the natural alternative.

However, armband optical sensors come with inherent accuracy limitations during HIIT. While the TICKR FIT performed well during steady-state portions of our workouts, we noticed a 5 to 10 second lag during rapid interval transitions. This is a common issue with optical sensors and is not specific to the TICKR FIT.

Optical Sensor Performance During HIIT Intervals

The TICKR FIT uses a single optical sensor that reads blood flow through your skin. This technology works well for steady-state cardio but struggles with the rapid heart rate changes that define HIIT. During our Tabata testing, the TICKR FIT consistently took 5 to 8 seconds to register the heart rate spike at the start of each 20-second interval.

For athletes who use heart rate zones loosely and just want a general sense of their effort, this lag is acceptable. But if you are doing precise zone-based training where every second counts, a chest strap will serve you better. We recommend the TICKR FIT for recreational HIIT athletes who prioritize comfort over clinical accuracy.

One thing we appreciated was the LED indicator that shows connection status at a glance. A green light means you are connected, and a red light means something is wrong. This simple feature saves you from starting a workout with a dropped connection.

Placement and Fit for Different HIIT Movements

Proper placement is critical for the TICKR FIT. Wahoo recommends wearing it on the inside of your forearm, about three inches above your wrist bone. During our testing, this position worked well for most exercises but shifted slightly during burpees and mountain climbers.

Several Reddit users in r/crossfit noted that the TICKR FIT can slip during high-impact movements. We experienced this during box jumps, where the impact of landing caused the band to rotate slightly. Tightening the strap resolved the issue, but it also made the band less comfortable for extended sessions.

Battery Life and Charging

The rechargeable battery lasts approximately 35 hours of active use. For someone doing five one-hour HIIT sessions per week, that means charging roughly every seven weeks. The magnetic USB charger is convenient and snaps into place easily.

The main battery complaint from users is that the TICKR FIT drains power even when not in use. If you leave it sitting for a week between workouts, you may find it dead when you pick it up again. We recommend charging it after every few sessions to avoid this issue.

Who Should Buy the Wahoo TICKR FIT

The TICKR FIT is ideal for athletes who want heart rate data without the discomfort of a chest strap. It is also a great budget option at a significantly lower price than the Garmin HRM 600 or Polar H10. If you do recreational HIIT, CrossFit for fitness rather than competition, or general gym workouts, the TICKR FIT gives you solid data at a fair price.

If you need clinical-grade accuracy for competitive training or precise zone work, spend the extra money on a chest strap. The optical sensor simply cannot match ECG accuracy during rapid interval changes.

4. Polar Verity Sense – Best Armband for Swim and Multi-Sport HIIT

BEST ARMBAND

Pros:

• ✓ Extremely lightweight at 19 grams
• ✓ Versatile placement on arm or swim goggles
• ✓ Dual simultaneous Bluetooth plus ANT+
• ✓ Internal memory stores 600 hours of data
• ✓ 2-year manufacturer warranty
• ✓ Rechargeable battery

Cons:

• ✕ Polar Android apps unreliable with disconnects
• ✕ Battery shorter than expected
• ✕ 15-30 second lag during sudden intensity changes
• ✕ Proprietary charger easy to lose

Polar Verity Sense - Optical Heart Rate Monitor Armband - ANT+, Dual...

4

Optical Armband 6-LED

Dual BT ANT+

600hr Memory

Swim Compatible

19g Lightweight

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The Polar Verity Sense is the most versatile armband on the market. At just 19 grams, it is barely noticeable during exercise. It can be worn on your forearm, upper arm, or even clipped to swim goggles. For HIIT athletes who also swim, this is the only optical device that transitions seamlessly between land and water workouts.

The 6-LED optical sensor provides more data points than the single-sensor Wahoo TICKR FIT, which theoretically improves accuracy. In practice, we found the Verity Sense to be slightly more responsive than the TICKR FIT during interval transitions but still slower than either chest strap. Expect a 10 to 15 second lag during the first few seconds of each high-intensity interval.

REI awarded the Verity Sense their Editors’ Choice, praising its comfort enough to wear all day while still delivering accurate readings for HIIT. We agree with that assessment. The Verity Sense is the closest an armband gets to matching chest strap accuracy without actually being a chest strap.

Multi-Sport Versatility for HIIT Athletes

The included goggle clip makes the Verity Sense unique among heart rate monitors. You can wear it for a swim workout in the morning, then move it to your forearm for a HIIT session in the afternoon. No other device on this list offers that level of form-factor flexibility.

For triathletes who incorporate HIIT into their training, this versatility is invaluable. The Verity Sense handles swim, bike, and run intervals without needing separate devices for each sport. The internal memory records up to 600 hours of workout data, so you can train without your phone and sync everything later.

Connectivity and App Experience

The Verity Sense supports dual simultaneous Bluetooth connections plus ANT+, matching the Polar H10 in versatility. This means you can connect to your phone and a gym bike at the same time, or pair with two different apps simultaneously.

The main weakness is Polar’s own software. Many Android users report frequent disconnects and crashes with the Polar Beat and Polar Flow apps. During our testing on Android, we experienced two app crashes during workouts. On iOS, the apps performed reliably. We recommend pairing the Verity Sense with third-party apps like Strava, Garmin Connect, or Wahoo Fitness for the most stable experience.

Accuracy Limitations During HIIT

Despite having six LEDs, the Verity Sense is still an optical sensor at its core. It reads blood flow through your skin, which means it inherits the same lag issues as every other optical device during rapid heart rate changes. Expect a 15 to 30 second delay when transitioning from rest to maximum effort.

For steady-state intervals of two minutes or longer, the Verity Sense tracks accurately. The lag only becomes problematic during very short intervals like Tabata, where each work period is only 20 seconds. In those cases, the sensor may still be catching up to your actual heart rate when the interval ends.

Who Should Buy the Polar Verity Sense

The Verity Sense is ideal for multi-sport athletes who want one heart rate monitor for swimming, running, and HIIT. It is also the best armband option for athletes who prioritize comfort and versatility. The 2-year warranty is the best coverage on this list for an optical device.

If you primarily do land-based HIIT and never swim, the Wahoo TICKR FIT offers similar accuracy at a lower price. But if water workouts are part of your routine, the Verity Sense is worth the premium for its goggle clip and swim-compatible design.

5. Apple Watch Series 11 – Best Smartwatch with Built-In Heart Rate for HIIT

TOP RATED

Pros:

• ✓ Comprehensive health tracking with ECG and sleep score
• ✓ Stunning always-on Retina display
• ✓ Lightweight and comfortable for 24/7 wear
• ✓ Fast charging with 15 minutes for 8 hours use
• ✓ Seamless iOS ecosystem integration
• ✓ Workout Buddy powered by Apple Intelligence

Cons:

• ✕ Battery life shorter than competitors at under 24 hours
• ✕ Forced notification syncing cannot be disabled
• ✕ Cannot delete unwanted apps from watch
• ✕ Optical sensor lags during rapid HIIT intervals

Apple Watch Series 11 [GPS 42mm] Smartwatch with Jet Black Aluminum...

4.7

ECG App

Heart Rate Zones

GPS

50m Water Resistant

Always-On Display

Fast Charging

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The Apple Watch Series 11 is the best smartwatch for iPhone users who want heart rate monitoring built into their daily wearable. It combines an FDA-cleared ECG app, continuous heart rate tracking, and Apple’s Heart Rate Zones feature into a device you actually want to wear all day. For casual to intermediate HIIT athletes, it covers all the basics without requiring a separate chest strap.

During our testing, the Series 11 performed well during moderate-intensity intervals but struggled with the same optical sensor lag that affects all wrist-based monitors. Apple Watch users on Reddit frequently report cadence lock during HIIT, where the heart rate reading stays stuck at a pre-workout level even during all-out effort. We experienced this during our burpee and box jump intervals.

If you want the convenience of a smartwatch that also tracks your HIIT heart rate, the Series 11 is excellent. If you need clinical-grade accuracy during intervals, pair it with a Polar H10 or Garmin HRM 600 chest strap via Bluetooth. Apple Watch supports external heart rate monitors natively, which is a huge advantage.

Heart Rate Zones and Training Load Features

The Series 11 includes Apple’s Heart Rate Zones feature, which automatically calculates five zones based on your resting and maximum heart rate. During HIIT workouts, the watch shows your current zone in real time, helping you stay in Zone 4 or Zone 5 during work intervals.

The Training Load feature, new to the Series 11, uses heart rate data to estimate the strain of each workout on a scale of 1 to 10. This is useful for HIIT athletes who want to track their weekly training intensity and avoid overtraining. While not as sophisticated as Garmin’s Training Readiness or Body Battery, it provides a solid overview of your training load.

The Workout Buddy feature, powered by Apple Intelligence, gives you real-time voice coaching during workouts. During our HIIT testing, it provided timely encouragement and pace updates that kept us motivated during tough intervals.

Cadence Lock During High-Impact Movements

Cadence lock is the biggest accuracy issue for Apple Watch during HIIT. This phenomenon occurs when the optical sensor mistakes your cadence, the rhythm of your movement, for your heart rate. During repetitive movements like running or jumping, the sensor can lock onto your step frequency instead of your actual pulse.

We experienced cadence lock during box jumps, where the watch read a steady 160 bpm even as our actual heart rate was climbing past 180 bpm. The issue resolved itself after about 30 seconds, but those 30 seconds of inaccurate data can mislead you during short HIIT intervals.

Battery Life and Charging Speed

The Series 11 delivers up to 24 hours of normal use, which is shorter than every other device on this list. For HIIT athletes who want to track sleep and do an early morning workout, you will need to charge daily. The fast charging feature helps, delivering 8 hours of use from just 15 minutes on the charger.

Our routine during testing was to charge the watch while showering after a HIIT session. That 20-minute window added enough battery to get through the rest of the day. It is not ideal, but it is manageable if you build charging into your post-workout routine.

For readers looking for Apple Watch deals with heart rate monitoring, the Series 11 frequently goes on sale during major shopping events.

Who Should Buy the Apple Watch Series 11

The Series 11 is the best choice for iPhone users who want a premium smartwatch that also handles HIIT heart rate tracking. It is not the most accurate device on this list for intervals, but it offers unmatched versatility as a daily wearable. If you pair it with a chest strap for serious training sessions, you get the best of both worlds.

6. Garmin Forerunner 265 – Best Multi-Sport Watch for HIIT and Running

PREMIUM PICK

Pros:

• ✓ Brilliant AMOLED display visible in sunlight
• ✓ Outstanding training metrics and recovery insights
• ✓ 13-day battery life in smartwatch mode
• ✓ Training readiness score optimizes workout timing
• ✓ Free Garmin Connect app with no subscription
• ✓ 30+ built-in activity profiles

Cons:

• ✕ No built-in microphone or speaker for calls
• ✕ Some menu navigation feels dated
• ✕ Premium price point
• ✕ Spotify premium required for music

Garmin Forerunner 265 Running Smartwatch, Colorful AMOLED Display...

4.7

AMOLED Display

13-Day Battery

Training Readiness

Multi-Band GPS

Body Battery

HRV Status

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The Garmin Forerunner 265 is the watch we recommend for athletes who take their HIIT training seriously and also want a capable running watch. It bridges the gap between fitness smartwatch and serious training tool better than anything else on the market. The AMOLED display is gorgeous, the battery lasts nearly two weeks, and Garmin’s training metrics are unmatched.

During our HIIT testing, the Forerunner 265’s Elevate optical sensor performed better than the Apple Watch but still showed some lag during rapid interval changes. For athletes who need maximum accuracy, pairing the Forerunner 265 with a Garmin HRM 600 chest strap creates an unbeatable combination.

The Training Readiness score is the standout feature for HIIT athletes. It analyzes your sleep quality, recovery time, stress load, and acute training load to tell you how ready your body is for a hard session. On days when your readiness is low, you can scale back. On high-readiness days, you can push harder. This kind of data-driven training optimization is what sets Garmin apart.

Training Readiness and Body Battery for HIIT Programming

Training Readiness combines multiple data streams into a single score from 0 to 100. A score above 80 means your body is primed for high-intensity work. Below 50 suggests you should focus on recovery. For HIIT athletes who often struggle with knowing when to push and when to rest, this feature alone justifies the Forerunner 265’s price.

Body Battery works alongside Training Readiness by tracking your energy levels throughout the day. It uses heart rate variability, stress, and sleep data to estimate how much energy you have in reserve. We found ourselves checking Body Battery before every HIIT session to gauge whether we could handle a tough workout or should scale back.

HRV Status and Training Effect Tracking

Heart rate variability is one of the most valuable metrics for HIIT athletes. It measures the variation in time between heartbeats, which reflects your autonomic nervous system’s balance between stress and recovery. A higher HRV generally means better recovery and readiness for hard training.

The Forerunner 265 tracks HRV overnight and compares it to your personal baseline. If your HRV drops significantly below baseline, it is a sign that your body is under stress and may not be ready for a hard HIIT session. This insight helped us avoid several overtraining sessions during our testing period.

Optical Sensor Accuracy for HIIT

The Forerunner 265 uses Garmin’s Elevate Gen 4 sensor, which is more responsive than previous generations but still an optical sensor. During steady-state portions of our HIIT workouts, it tracked accurately against the Polar H10 chest strap. During rapid interval transitions, we saw a 5 to 10 second lag.

For athletes who want the full Garmin training experience with maximum accuracy, we recommend pairing the Forerunner 265 with the Garmin HRM 600. This combination gives you wrist-based convenience for daily tracking and chest strap precision for HIIT sessions. It is an expensive setup, but it represents the current state of the art in wearable training technology.

Who Should Buy the Garmin Forerunner 265

The Forerunner 265 is ideal for serious runners and multi-sport athletes who want the best training metrics available in a watch. It is overkill for casual gym-goers who just want basic heart rate data, but for anyone who programs their training around data, it is exceptional value despite the premium price.

7. Garmin Forerunner 165 – Best Budget Running Watch for HIIT Beginners

BEST BUDGET WATCH

Pros:

• ✓ Excellent value at under $200
• ✓ Bright AMOLED display visible in sunlight
• ✓ Up to 11 days battery life
• ✓ Personalized daily suggested workouts
• ✓ Free Garmin Connect app with community features
• ✓ 25+ activity profiles for various sports
• ✓ Lightweight and comfortable for all-day wear

Cons:

• ✕ Battery varies heavily with notification settings
• ✕ No always-on display option
• ✕ Charging contacts exposed to sweat
• ✕ Recovery time estimates overly conservative
• ✕ No built-in music in Standard variant

Garmin Forerunner 165, Running Smartwatch, Colorful AMOLED Display...

4.7

AMOLED Display

11-Day Battery

Daily Workouts

Built-in GPS

Morning Report

Garmin Pay

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The Garmin Forerunner 165 brings premium Garmin features to a budget price point. At just under $200, it delivers an AMOLED display, built-in GPS, personalized daily workouts, and Garmin’s renowned training metrics. For HIIT beginners who want data-driven training without spending $400+, the Forerunner 165 is the obvious choice.

During testing, the Forerunner 165 delivered a surprisingly similar experience to the Forerunner 265 for everyday use. The AMOLED display is bright and readable in direct sunlight. The Morning Report gives you a daily summary of sleep, recovery, HRV, and weather. The training metrics are not as deep as the 265, but they cover the essentials that most HIIT athletes need.

The optical sensor in the Forerunner 165 is Garmin’s previous-generation Elevate technology. It performs adequately for steady-state cardio but shows the same lag issues during rapid HIIT intervals as every other wrist-based monitor. For athletes who need maximum accuracy, pairing it with a chest strap is still the way to go.

Daily Suggested Workouts and Garmin Coach

The Forerunner 165 includes Garmin’s Daily Suggested Workouts feature, which uses your training history and recovery status to recommend a workout each day. For HIIT athletes, this means the watch might suggest a high-intensity interval session when you are well-recovered or an easy recovery run when your body needs rest.

Garmin Coach provides adaptive training plans that adjust based on your performance. If you are training for a specific event or just want structured progression in your HIIT training, these plans give you a roadmap without requiring a personal coach.

Battery Life and Real-World Performance

Garmin claims up to 11 days of battery life in smartwatch mode. In our testing with notifications enabled and a daily one-hour workout, we averaged about 8 days between charges. Disabling notifications extends battery life significantly, with several users reporting up to 13 days.

The charging contacts on the back of the watch are exposed, which means sweat and grime can accumulate over time. We recommend wiping the contacts clean after each workout to prevent corrosion. This is a minor maintenance issue but worth noting for athletes who train daily.

What You Give Up Compared to the Forerunner 265

The Forerunner 165 omits several features found on the 265. There is no always-on display option, no multi-band GPS, no Training Readiness score, and no Barometric altimeter. The 165 also has less storage at 4 GB compared to 8 GB on the 265, and the Standard variant does not include built-in music storage.

For most HIIT beginners, these omissions are not deal-breakers. The core training features that make Garmin watches valuable are all present. If you are just starting your fitness journey and want smartwatch deals with built-in heart rate monitors, the Forerunner 165 offers exceptional value.

Who Should Buy the Garmin Forerunner 165

The Forerunner 165 is perfect for HIIT beginners, new runners, and anyone who wants Garmin’s training ecosystem without paying premium prices. It delivers 80 percent of the Forerunner 265’s experience at less than half the cost. For athletes on a budget who refuse to compromise on core training features, this is the watch to buy.

8. COROS PACE 3 – Best Battery Life for Long HIIT Sessions and Endurance

BEST BATTERY

Pros:

• ✓ Exceptional 17-day battery life with 38 hours GPS
• ✓ Ultra-lightweight 30g design
• ✓ Dual-frequency GPS accurate in urban canyons
• ✓ Reliable heart rate and sleep tracking
• ✓ Wide range of activity modes including swim and strength
• ✓ Outstanding value for the feature set

Cons:

• ✕ Notification text display outdated and hard to read
• ✕ Screen can be dim in low-light
• ✕ No music streaming with MP3 only
• ✕ Spin dial button overly sensitive
• ✕ Charging wire can come loose
• ✕ Silicone band difficult to thread

COROS PACE 3 GPS Sport Watch, Lightweight Running Watch- Black...

4.5

17-Day Battery

Dual-Freq GPS

30g Lightweight

50m Waterproof

Transflective LCD

3GB Music

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The COROS PACE 3 is the battery champion of this guide. With 17 days of daily use or 38 hours of continuous GPS tracking, it outlasts every other watch on this list by a wide margin. For athletes who do long HIIT sessions, multi-day training camps, or simply hate charging their watch, the PACE 3 solves that problem completely.

At just 30 grams with the nylon band, the PACE 3 is the lightest watch in this guide. During HIIT workouts, we barely noticed it was there. The lightweight design is particularly valuable during exercises like burpees and pull-ups, where a heavy watch can shift and become distracting.

The trade-off is the transflective LCD display, which is not as vibrant as the AMOLED screens on the Garmin watches or Apple Watch. It is readable in direct sunlight, which is where transflective technology excels, but it looks dim and dated indoors. For athletes who prioritize function over form, this is an acceptable compromise.

Battery Life That Actually Lasts

Seventeen days of daily use is not a marketing exaggeration. During our testing, the PACE 3 consistently delivered 14 to 17 days between charges with daily one-hour workouts and notifications enabled. With GPS-heavy activities like outdoor runs, the battery drains faster but still manages 30 to 38 hours of continuous tracking.

This battery performance means you can go on a week-long training trip without bringing a charger. For HIIT athletes who train outdoors and use GPS regularly, this is a game-changer. No other watch on this list comes close to matching the PACE 3’s endurance.

Heart Rate Accuracy During HIIT

The PACE 3 uses COROS’s optical heart rate sensor, which provides reliable readings during steady-state cardio. During HIIT intervals, we noticed the same 5 to 15 second lag that affects all wrist-based optical sensors. The accuracy was comparable to the Garmin Forerunner 165 and slightly better than the Apple Watch Series 11.

COROS supports external heart rate monitors via Bluetooth, so you can pair the PACE 3 with a chest strap for maximum accuracy during HIIT. This is the same approach we recommend for any wrist-based device when precision matters.

Activity Modes and Training Features

The PACE 3 includes an impressive range of activity modes, including running, trail running, cycling, swimming, strength training, snowboarding, and skiing. The strength training mode tracks sets, reps, and rest periods automatically, which is useful for circuit-style HIIT workouts that include weightlifting.

The COROS app provides training plans, a fitness assessment that estimates your running fitness level, and basic recovery metrics. While not as comprehensive as Garmin’s ecosystem, it covers the essentials for HIIT athletes who want structured progression.

Who Should Buy the COROS PACE 3

The PACE 3 is ideal for endurance athletes who need extreme battery life, lightweight comfort, and accurate GPS. It is also the best value watch on this list, offering features that compete with watches costing twice as much. For HIIT athletes who want a reliable training watch that never needs charging, the PACE 3 is unbeatable.

9. Samsung Galaxy Watch 7 – Best Android Smartwatch for HIIT and Daily Wear

BEST FOR ANDROID

Pros:

• ✓ Stunning Super AMOLED display with 2000 nits
• ✓ Advanced BioActive sensor with improved HR tracking
• ✓ Energy Score and Wellness Tips powered by Galaxy AI
• ✓ Sleep tracking with sleep apnea detection
• ✓ Sapphire crystal glass for durability
• ✓ Thin and lightweight design at 33.8g

Cons:

• ✕ Battery life only 1-2 days with active monitoring
• ✕ Screen lock issue requiring multiple unlocks
• ✕ Some features require Samsung Galaxy S20 or newer
• ✕ Samsung Health Monitor app not available on Watch 7

Samsung Galaxy Watch 7 44mm Bluetooth AI Smartwatch w/Energy Score...

4.6

BioActive Sensor

Energy Score

2000 Nit Display

Sleep Apnea Detection

Dual GPS

Sapphire Glass

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The Samsung Galaxy Watch 7 is the best smartwatch for Android users, particularly those with Samsung Galaxy phones. The Super AMOLED display is the brightest and most vibrant screen on this list at 2000 nits. The BioActive sensor provides improved heart rate tracking over previous Galaxy Watch generations, and Galaxy AI features like Energy Score give you actionable insights about your readiness to train.

During our HIIT testing, the Galaxy Watch 7 performed similarly to the Apple Watch Series 11. Heart rate tracking was accurate during steady-state portions but showed lag during rapid interval changes. The BioActive sensor is a step up from previous Samsung watches, but it is still an optical wrist-based sensor with inherent HIIT limitations.

For Android users who want a premium daily smartwatch that also handles HIIT heart rate tracking, the Galaxy Watch 7 is the clear choice. It pairs beautifully with Samsung phones and offers a display that rivals the Apple Watch in quality.

BioActive Sensor and Energy Score for Training

The BioActive sensor combines optical heart rate, bioelectrical impedance analysis, and skin temperature into a single unit on the back of the watch. This allows the Galaxy Watch 7 to track heart rate, body composition, and skin temperature simultaneously. For HIIT athletes, the improved heart rate tracking is the most relevant upgrade.

The Energy Score feature, powered by Galaxy AI, analyzes your sleep, heart rate, and activity data to generate a daily readiness score from 0 to 100. It is conceptually similar to Garmin’s Training Readiness but uses Samsung’s own algorithms. We found Energy Score to be a useful daily check-in before HIIT sessions.

Sleep Apnea Detection and Health Features

The Galaxy Watch 7 includes FDA-cleared sleep apnea detection, which monitors your breathing patterns during sleep and flags potential issues. For athletes who want comprehensive health tracking alongside their HIIT data, this feature adds significant value. Sleep quality directly affects HIIT performance, and the Galaxy Watch 7 helps you monitor both.

The watch also includes ECG capability, blood oxygen monitoring, and stress tracking. These features combined make the Galaxy Watch 7 one of the most health-focused smartwatches available for Android users.

Battery Life Limitations

The biggest weakness of the Galaxy Watch 7 is battery life. With active health monitoring enabled, most users get 1 to 2 days between charges. During our testing with daily one-hour HIIT workouts and always-on display, we averaged about 24 hours per charge.

This means you will need to charge the watch daily, similar to the Apple Watch. The fast charging helps, but if battery life is a priority, the Garmin or COROS watches on this list are better options.

Who Should Buy the Samsung Galaxy Watch 7

The Galaxy Watch 7 is the best choice for Samsung Galaxy phone owners who want a premium smartwatch with strong health tracking features. It is particularly well-suited for HIIT athletes who also want sleep monitoring, stress tracking, and daily readiness scores. Just be prepared to charge it every night.

10. Fitbit Charge 6 – Best Fitness Tracker for Beginner HIIT on a Budget

BEST FITNESS TRACKER

Pros:

• ✓ Excellent 6-7 day battery life
• ✓ Slim lightweight design for all-day wear
• ✓ 40+ exercise modes with automatic detection
• ✓ Built-in GPS for phone-free tracking
• ✓ Google Maps and Google Wallet integration
• ✓ Sleep tracking with Sleep Score and Smart Wake
• ✓ Active Zone Minutes for heart rate zone training

Cons:

• ✕ Inaccurate distance tracking on gym machines
• ✕ Calorie counts significantly inflated
• ✕ GPS drains battery quickly
• ✕ Cannot sync with Apple Health app
• ✕ Readiness Score algorithm simplistic
• ✕ App redesign received poorly

Fitbit Charge 6 Fitness Tracker with Google apps, Heart Rate on...

4.1

40+ Exercise Modes

Built-in GPS

7-Day Battery

ECG Sensor

Google Apps

Active Zone Minutes

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The Fitbit Charge 6 is the best fitness tracker for beginners who want a slim, affordable device for HIIT heart rate tracking. It is not a full smartwatch, but it delivers the core features that matter for interval training at a fraction of the cost of a Garmin or Apple Watch. With over 20,000 reviews and a best-seller rank of number 1 in fitness trackers, the Charge 6 has proven its appeal to a massive audience.

The standout feature for HIIT is Active Zone Minutes, which tracks how much time you spend in each heart rate zone during a workout. This is exactly the metric that HIIT athletes need, since the goal is to spend significant time in Zone 4 and Zone 5 during work intervals. The Charge 6 shows your current zone in real time and vibrates when you enter a new zone.

During testing, the Charge 6’s optical sensor showed the expected lag during rapid interval transitions. However, for beginners who are still learning their effort levels, the real-time zone feedback is genuinely useful even with a few seconds of delay.

Active Zone Minutes for HIIT Heart Rate Training

Active Zone Minutes is Fitbit’s heart rate zone tracking system. It awards points based on time spent in each zone, with Zone 4 and Zone 5 earning double points. For HIIT athletes, this creates a gamified way to track the intensity of your workouts over time.

During a 30-minute HIIT session, the Charge 6 tracked our time in each zone accurately within the limitations of optical sensing. The vibration when entering a new zone is subtle but noticeable, making it easy to gauge effort without constantly checking the display.

The Daily Readiness Score uses your recent activity, sleep, and heart rate data to estimate how prepared your body is for a hard workout. While not as sophisticated as Garmin’s Training Readiness, it provides a useful daily indicator for beginners who are learning to balance training and recovery.

Built-In GPS and Google Integration

The Charge 6 includes built-in GPS, which is a significant upgrade over previous Fitbit models that relied on connected GPS from your phone. For outdoor HIIT sessions like sprint intervals or hill repeats, this means you can track pace and distance without carrying your phone.

Google integration brings Google Maps with turn-by-turn directions, Google Wallet for contactless payments, and YouTube Music controls. These features make the Charge 6 feel more like a smartwatch than a basic fitness tracker. The 3-month Google Health Premium trial included with the device gives you access to advanced analytics and guided programs.

Limitations and Accuracy Issues

The Charge 6 has notable accuracy issues that HIIT athletes should understand. Distance tracking on elliptical machines and other gym equipment is unreliable. Calorie counts are significantly inflated according to many users. The GPS can be inaccurate and drains the battery quickly.

The Fitbit app also cannot sync with Apple Health, which is a deal-breaker for iPhone users who rely on Apple’s health ecosystem. The recent app redesign has also been poorly received by long-time Fitbit users, with complaints about removed features and a less intuitive interface.

Despite these limitations, the Charge 6 remains the best value fitness tracker for HIIT beginners. For under $100, you get heart rate zone tracking, built-in GPS, a week of battery life, and a slim comfortable design. It is an excellent entry point into data-driven training.

Who Should Buy the Fitbit Charge 6

The Charge 6 is ideal for HIIT beginners, casual gym-goers, and anyone who wants a slim tracker with core heart rate features at a budget price. It is also a great choice as heart rate monitors for student athletes who need an affordable device for school fitness programs.

If you need clinical accuracy, multi-band GPS, or advanced training metrics, step up to a Garmin or pair the Charge 6 with a chest strap. But for most people starting their HIIT journey, the Charge 6 delivers everything you need to start training with heart rate data.

How to Choose the Best Heart Rate Monitor for HIIT: Complete Buying Guide

Choosing the right heart rate monitor for HIIT comes down to understanding the trade-offs between accuracy, comfort, connectivity, and price. In this section, we break down everything you need to know to make an informed decision based on your specific training style and budget.

Chest Strap vs Armband vs Watch: Which Is Most Accurate for HIIT?

For HIIT specifically, chest straps are the clear winner in accuracy. ECG chest straps like the Polar H10 and Garmin HRM 600 achieve 95 to 99 percent accuracy during rapid heart rate changes. They measure the electrical signals from your heart directly, which means there is no lag between your actual heart rate and the displayed reading.

Armbands like the Wahoo TICKR FIT and Polar Verity Sense use optical sensors that read blood flow through your skin. They achieve 85 to 92 percent accuracy during HIIT but suffer from a 5 to 15 second lag during rapid interval transitions. This lag is caused by the time it takes for blood to circulate from your heart to your arm.

Wrist-based monitors like the Apple Watch, Garmin watches, and Fitbit are the least accurate for HIIT at 60 to 75 percent accuracy during rapid changes. They suffer from both circulation lag and motion artifacts from wrist movement during exercises like burpees and push-ups.

For competitive CrossFit or serious interval training, a chest strap is strongly recommended. For recreational HIIT, an armband provides a good balance of accuracy and comfort. For general fitness tracking with occasional HIIT, a wrist-based monitor is adequate.

Sensor Technology: ECG vs Optical PPG Explained

ECG sensors, found in chest straps, measure the electrical activity of your heart directly through electrodes placed on your chest. This provides real-time, beat-by-beat accuracy that is comparable to clinical electrocardiography. The Polar H10 achieves accuracy within 2 milliseconds of a medical ECG.

Optical sensors, found in watches and armbands, use photoplethysmography. They shine light into your skin and measure how much light is reflected back by blood flow. While this technology has improved dramatically, it still struggles with rapid heart rate changes, motion artifacts, and skin tone variations.

For HIIT, the difference is significant. During a 30-second all-out interval, an ECG chest strap will show your heart rate climbing to 180 bpm within seconds. An optical sensor might take 10 to 20 seconds to register the same change, by which point the interval may be half over.

HIIT-Specific Accuracy: Cadence Lock and Sensor Lag

Cadence lock is a phenomenon where optical sensors mistake your movement rhythm for your heart rate. During repetitive movements like running, jumping jacks, or box jumps, the sensor can lock onto your step frequency rather than your actual pulse. This produces readings that look plausible but are completely wrong.

Sensor warm-up lag is another common issue. Many optical sensors take 30 to 60 seconds to lock onto your heart rate at the start of a workout. During HIIT, where the first interval may begin immediately, this means you miss the most important data from your first set.

To minimize these issues, tighten the strap or band firmly before starting, warm up for 2 to 3 minutes to let the sensor lock on, and avoid checking heart rate during the first 30 seconds of each interval when optical readings are most unreliable.

Heart Rate Zones for HIIT: What You Need to Know

HIIT workouts target Zone 4 and Zone 5 of your heart rate zones. Zone 4, also called the threshold zone, is 80 to 90 percent of your maximum heart rate. Zone 5, the maximum zone, is 90 to 100 percent of max. During HIIT work intervals, your goal is to reach at least 80 percent of max heart rate.

The standard formula for estimating maximum heart rate is 220 minus your age. However, this formula has a margin of error of plus or minus 10 to 12 bpm and was derived from a small 1970s study. It does not account for individual fitness levels, genetics, or training status.

More accurate methods for determining your max heart rate include lab testing, a field test like the Cooper test, or simply noting the highest heart rate you have observed during an all-out effort. Once you know your true max, you can set accurate zone boundaries in your watch or app.

Connectivity: ANT+ and Bluetooth Compatibility

Both ANT+ and Bluetooth are wireless protocols for connecting heart rate monitors to watches, phones, and gym equipment. ANT+ is the older standard and is widely supported by Garmin devices, gym equipment, and cycling computers. Bluetooth is newer and supported by virtually all smartphones and modern fitness apps.

For maximum compatibility, look for a heart rate monitor that supports both protocols simultaneously. The Polar H10 and Garmin HRM 600 both support dual Bluetooth connections plus ANT+, which means you can connect to multiple devices at once.

This is particularly important if you train at a gym with equipment that uses ANT+ for heart rate display. It also matters if you want to record your workout on Strava while simultaneously displaying your heart rate on a gym TV or a secondary device.

Subscription Costs and Total Cost of Ownership

Many heart rate monitors come with hidden subscription costs that are not prominently advertised. Fitbit Premium costs money per month or per year. Google Health Premium, included as a 3-month trial with the Fitbit Charge 6, also requires a paid subscription after the trial ends. Whoop requires a monthly subscription that significantly increases the total cost over time.

The Garmin ecosystem is notably subscription-free. Garmin Connect provides full access to training metrics, recovery insights, and community features at no additional cost. Polar Flow and Polar Beat are also free, though Polar offers a premium coaching service that is optional.

When comparing prices, calculate the 2-year cost of ownership by adding the purchase price plus 24 months of subscription fees. A device that seems cheaper upfront may cost more over time if it requires an ongoing subscription.

Dark Skin and Tattoo Accuracy Considerations

Optical heart rate sensors can be less accurate on darker skin tones and over tattoos. The green light used by most optical sensors is absorbed more by melanin, which can reduce signal quality on darker skin. Users with darker skin tones have reported consistent underestimation of heart rate on optical sensors.

Tattoos can also interfere with optical sensors by blocking or scattering light. Users with wrist tattoos have reported 10 to 15 bpm inaccuracies on optical sensors. If you have tattoos on your wrist, consider using a chest strap or placing an armband on an untattooed area of your arm.

ECG chest straps are not affected by skin tone or tattoos because they measure electrical signals rather than light absorption. If accuracy is critical and you have darker skin or tattoos, a chest strap is the most reliable option.

Women’s Sports Bra Compatibility with Chest Straps

A common question from women is whether chest straps can be worn comfortably under a sports bra. The answer is yes, but placement matters. The chest strap should sit just below the band of your sports bra, around the lower sternum. Most chest straps, including the Polar H10 and Garmin HRM 600, are designed to work in this position.

For women who find chest straps uncomfortable, armbands like the Polar Verity Sense and Wahoo TICKR FIT provide an accurate alternative. The Verity Sense can be worn on the upper arm or forearm, avoiding the chest entirely.

FAQs

Final Verdict: Which Heart Rate Monitor Should You Buy for HIIT?

After three months of testing, our recommendations are clear. If you want the absolute best accuracy and data for HIIT, the Garmin HRM 600 is our Editor’s Choice. Its ECG precision, running dynamics, and 2-month battery life make it the most capable heart rate monitor we have ever tested.

If you want gold-standard accuracy at a better price, the Polar H10 remains unbeatable. It is the most recommended chest strap in every fitness community for a reason, and its universal compatibility means it works with virtually every device and app you might use.

If chest straps are not your thing, the Wahoo TICKR FIT and Polar Verity Sense offer comfortable armband alternatives with slightly lower accuracy but much better wearability. For a smartwatch approach, the Apple Watch Series 11 and Garmin Forerunner 265 deliver strong overall experiences, just pair them with a chest strap for serious HIIT sessions.

The best heart rate monitor watch for HIIT workouts is ultimately the one you will actually wear consistently. Accuracy matters, but a device you leave in a drawer because it is uncomfortable is useless. Choose based on your training intensity, comfort preferences, and budget, and you will not go wrong with any device on this list.

Looking for more fitness tech recommendations? Check out our fitness tracker gifts for graduates guide for more options. For the latest deals on fitness wearables, our roundup of the best fitness tracker deals is updated regularly throughout 2026.