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The Best Heart Rate Monitors

Steps once reigned supreme as the go-to metric for fitness trackers, but nowadays heart rate monitoring has become the fundamental feature. Tracking your heart rate allows you to see how hard you’ve pushed yourself in an individual workout by the time spent in each heart rate zone. Most trackers will also provide a measure of your overall fitness over time through your resting heart rate or an estimate of your VO2 max. And 24/7 heart rate tracking can monitor your progress towards the target of 150 minutes of moderate cardio activity a week, approved by the NHS and the World Health Organisation.

These features are appearing on all the best fitness trackers now, but you won’t find heart rate monitors on wrist-worn devices. There are also dedicated heart rate trackers, which are worn around your arm or chest, and even a ring that can monitor your heart rate and heart rate variability.

We’ve put all types to the test and picked the best heart rate trackers of various types below. You’ll also find a buyer’s guide to help you figure out which kind of heart rate monitor will suit you best.

The Best Heart Rate Monitors

Fitbit Inspire 2 watch with heart rate monitor

(Image credit: Fitbit)
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Best For Tracking Your 150 Minutes Of Activity A Week

Reasons to buy

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Slim design
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User-friendly interface
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Great activity tracking
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Affordable

Reasons to avoid

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Limited sports tracking
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Small screen

Fitbit epitomises the change in fitness tracking from steps to heart rate, with all but one device in the brand’s current line-up including an optical heart rate monitor. All of Fitbit’s best features are linked to the HRM as well, taking the heart rate information it tracks around the clock and using it to provide easy-to-understand insights into your health and fitness.

In the partner app you can view your resting heart rate over time, which is a solid indication of whether you are getting fitter – you want that number to go down – and also your Cardio Fitness Score. This is Fitbit’s equivalent of a VO2 max measurement and another useful stat that shows your general cardiovascular fitness. In this case, you want the number to go up over time. The HRM also feeds into Fitbit’s sleep tracking, and for both your slumber and Cardio Fitness Score, your numbers are compared with those of other Fitbit users of your age and sex, so you can see how you stack up.

In 2020 Fitbit debuted Active Zone Minutes which clearly tracks your progress towards the weekly target of 150 minutes of moderate cardio.

active-zone-minutes-fitbit-app-android

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Time spent in high heart rate zones, as when running, counts double, but Fitbits will also automatically log every time your heart rate moves into a slightly higher heart rate zone, when you’re walking to the shops for instance, and add that to your tally. It also breaks the 150 minutes into 22-minute daily chunks, which helps to make it feel more achievable.

We recommend the Inspire 2 because it’s the cheapest Fitbit with Active Zone Minutes, and it’s great value at under £100. If you’re a committed exerciser, however, you’ll be better served by the Charge 4 (£129.99), which has a larger body and a thicker strap, and which we found tends to return more accurate readings when you’re working up a sweat.

Buy from Fitbit (opens in new tab) | £89.99 | Fitbit Inspire 2 review


Polar Inspire 2

Polar Inspire 2 displaying Fitspark’s cardio workout recommendation (Image credit: Polar)
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2. Polar Ignite 2

Best For Guided Training

Reasons to buy

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Good sports tracking
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Smart suggested workouts
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Advanced sleep analysis

Reasons to avoid

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Touchscreen can lag
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Short battery life

The Ignite 2 is an impressive sports watch that tracks all kinds of data along with your heart rate, but what makes it stand out is how Polar uses that data to provide guided training plans and suggested workouts.

This starts with the running event training plans offered through the Polar Flow website and app, designed to improve your fitness and speed. The sessions sync to the watch and tell you which heart rate zone to work in and how long for.

However, it’s at night when the Ignite really comes into its own. It uses its heart rate monitor to track your heart rate and heart rate variability – a useful measure of how physically stressed your body is – to record how well you’ve actually recovered during your sleep. The next morning you’re given a rating of how well you’ve slept and how well your autonomic nervous system has recovered, which leads to recommendations for workouts based on your readiness to train that day.

The cardio workouts that it suggests can be done with any sport that gets your heart pumping, and the watch guides you into different heart rate zones depending on what type of training you’re doing – be it intervals where you spike your heart rate before taking a short break to recover or a steady effort where you aim to stay in one zone throughout.

Buy from Polar (opens in new tab) | £199.50


Apple Watch Series 7

Apple Watch Series 7 allows you to add heart rate data to your home screen (Image credit: Apple)
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Best For Advanced Features

Reasons to buy

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Very accurate for a wrist monitor
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Attractive design
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Impressive app store

Reasons to avoid

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One-day battery life
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Basic native sports tracking
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Poor sleep tracking

Early versions of the Apple Watch were undermined by inaccurate heart rate tracking, but from the Series 4 onwards it carried one of the best wrist-worn sensors. The Apple Watch now tracks heart rate accurately throughout the day and during exercise, even if you do a HIIT session where your heart rate should rise and fall rapidly.

With this new sensor came the ability to take medical-grade electrocardiogram (ECG) measurements, taken by resting a finger tip against the button on the side of the watch for 30 seconds. It can detect signs of atrial fibrillation (irregular heartbeat), a condition which should also prompt a visit to your GP to get a proper medical diagnosis.

The watch will also alert you if your heart rate is abnormally high or low during the day or night, and again, if you’re getting these alerts frequently it’s worth going to the doctor with that info in case it’s a sign of something serious.

Along with these detailed health stats, the Apple Watch will estimate your resting heart rate and VO2 max, both good indicators of your overall cardiovascular fitness, and track how quickly your heart rate returns to normal after strenuous exercise – that recovery time being another good measure of your fitness.

Alongside these native features there are also many Apple Watch apps that can use the heart rate monitor for advanced analysis of things like your recovery after training sessions or your heart variability during your sleep.

Buy from Apple (opens in new tab) | From £369


Polar H10 chest strap heart rate monitor

(Image credit: Polar)
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4. Polar H10

Best All-Round Chest Strap

Reasons to buy

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Comfortable
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Long battery life

Reasons to avoid

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Battery isn’t rechargeable

The H10 is accurate, comfortable and able to connect to two devices at the same time via Bluetooth, ANT+ and 5kHz, with the latter meaning it can be used for swimming. The battery lasts 400 hours before it needs to be replaced, which means even keen athletes will get through most of a year before having to replace it (a CR2025 replacement costs a couple of quid).

It’s also the most comfortable chest strap we’ve worn, a consideration that shouldn’t be underestimated. We found the buckle-like attachment better than the usual slip and loop you get on chest straps, and haven’t had any skin irritation from the H10 while using it for runs every day for months.

Buy from Polar (opens in new tab) | £76.50


myzone-mz-switch-heart-rate-trackers

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Most Versatile

Reasons to buy

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Wear on chest, arm or wrist
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MyZone app gamifies fitness
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Long battery life

Reasons to avoid

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Expensive

The MZ-Switch lives up to its name by being able to track your heart rate from your wrist, arm or chest. It contains an ECG sensor for measurements on the chest – the most accurate position – plus an optical PPG sensor for tracking from your arm or wrist, which many find more comfortable and convenient than a chest strap.

Wherever you wear it, you’ll be earning MyZone Effort Points (MEPs) during your exercise, and these are being earned at a faster rate when you’re working in higher heart rate zones. It’s another way to motivate yourself during HIIT sessions in particular, and some gym chains have partnered with MyZone to broadcast your heart rate and zone to screens during classes to help you work at the right intensity.

The MZ-Switch also boasts an impressive battery life for such a small, rechargeable device, lasting three to six months (the optical sensor uses more battery than the ECG). It connects easily to any device via ANT+ or Bluetooth, and swapping the sensor between the included straps for your chest, wrist and arm is a doddle.

The only real downside here is the price – it’s more cost-effective to buy a separate arm and chest strap tracker if you don’t plan on using the MyZone app and earning those MEPs.

Buy from MyZone (opens in new tab) | £139.99 | MyZone MZ-Switch review


polar verity sense

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6. Polar Verity Sense

Best Arm Strap

Reasons to buy

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Comfortable strap
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Waterproof and attaches to goggles
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Can record workouts itself

Reasons to avoid

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20-hour battery life
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Fiddly charger

Our previous favourite arm strap HRM was the Polar OH1 (opens in new tab), and the Verity Sense is a straightforward upgrade. The battery life is longer at 20 hours (vs 12), the Bluetooth range is twice as big at 150m, it has a bigger memory for storing workouts, and it’s also waterproof to 50m, compared with the 30m of the OH1. The Verity Sense also comes with a clip so you can attach it to your goggles for measurements in the water.

Arm straps offer more accuracy than a wrist-based monitor while being more convenient and comfortable than a chest strap. The Verity Sense slips on easily and in our tests we found it impressively close to a chest strap’s readings in running, strength and cycling sessions.

It connects via both ANT+ and Bluetooth, and the lights system on the device shows the three training modes available. The first is for when you want to pair it to a device like a watch, the second is for recording a workout directly on the Verity Sense itself (which links to Polar’s Flow app to show your readings), and the third is a swimming mode.

Buy from Polar (opens in new tab) | £79.50


Garmin HRM-Pro heart rate monitor

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8. Garmin HRM-Pro

Best For Runners And Triathletes

Reasons to buy

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Advanced running analysis
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Works for swimming
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Comfortable strap

Reasons to avoid

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Changing battery is a nightmare
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Expensive

If you’re a keen sportsperson the HRM-Pro is the best heart rate chest strap you can get, especially if you already have a Garmin device to link it to. It doesn’t come cheap, but the strap tracks a variety of extra running stats and works in the water, storing your heart rate data from swims to then transmit to the activity record from your Garmin once you’ve finished (Bluetooth does not work well, if at all, under water).

For runners the HRM-Pro records technique stats like ground contact time and vertical oscillation, and if you have a compatible Garmin watch you can see these stats live during your run. Many of them are even colour-coded to let you know what’s good, so you can work on improving your technique without having to focus on individual numbers.

Buy from Garmin (opens in new tab) | £119.99


Wahoo TICKR

(Image credit: Wahoo)
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9. Wahoo TICKR

Best Under £50

Reasons to buy

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Good value
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Long battery life

Reasons to avoid

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Not as comfortable as other chest straps
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Not rechargeable

Wahoo has recently updated its popular TICKR heart rate monitors: both the standard TICKR and the TICKR X have seen an increase of almost 50% in the life of the CR2032 coin battery they use. That’s up to 500 hours – you’ll have to be an elite athlete to get through that in a year. The more expensive TICKR X (opens in new tab) (£64.99) adds running dynamics stats like vertical oscillation and ground contact time, but if you don’t feel the need for those extras then stick with the cheaper TICKR, which offers tremendous value. It can connect via ANT+ and Bluetooth, and can be paired with up to three Bluetooth devices at once.

Buy from Wahoo (opens in new tab) | £39.99


Whoop 4.0 band

(Image credit: Whoop)
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Best For Tracking Your Training Load

Reasons to buy

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Detailed training insights
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Useful sleep analysis
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Comfortable and stylish strap

Reasons to avoid

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Requires monthly subscription

The Whoop band is targeted at the seriously sporty and breaks your life into two periods – strain and recovery – in order to help you plan your training and recovery to ensure you’re striking the right balance to get fitter. The tracker uses an optical heart rate sensor and can be worn on the wrist or arm, or inside pockets in dedicated clothing like bras and pants. 

Your workouts are automatically logged and, along with your daily activity, contribute to your strain score, which rates the stress you’re placing on your body. This is balanced against your recovery score, which is largely based on how well you sleep. That’s the top level insight, but the Whoop app contains a lot more detail and data to help shape your training regime.

The band is also stylish and comfortable to wear 24/7 – you can even charge it while you wear it using the power pack provided – and there are lots of different straps to buy to better match your style.

Whoop’s payment model is one off-putting aspect, however. You do not pay for the strap, but instead have to pay a monthly membership, and the minimum length of contract is 12 months, priced at £30 a month (it drops to £20 a month overall if you pay for 24 months up front – that’s £480).

Sign up (opens in new tab) | £20-£30 a month, minimum 12-month contract | Whoop 4.0 review


Oura Ring Gen3

(Image credit: Nick Harris-Fry / Future)
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Best Sleep And Recovery Tracker

Reasons to buy

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Most accurate sleep tracking
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Useful recovery and readiness advice
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Unobtrusive ring design

Reasons to avoid

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Poor daily heart rate tracking
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Expensive and requires monthly subscription

The Oura Ring focuses on tracking your sleep and recovery to give you a readiness rating each day, and it excels in this role, providing the most accurate sleep analysis and useful readiness advice of any wearable we’ve tested. The ring design also makes it comfortable and unobtrusive to wear, and we’ve had one Oura or another on our finger since we first tested the Oura 2.0 a year ago.

It’s not all rosy, however. The Oura Ring is expensive and you have to pay $5.99 (around £4.59) on top of that initial outlay to unlock all the analysis in the app. In addition the ring is less useful during the day than most trackers – we found its heart rate readings spotty, and a promised workout heart rate feature is yet to arrive.

Buy from Oura (opens in new tab) | $299 (around £229) | Oura Ring 3 review

Heart Rate Monitors Buyer’s Guide

The most common heart rate trackers are watches worn on the wrist, armbands for the forearm or biceps, or chest straps.

Of the three places on your body you can wear them, the chest is your best bet if accuracy during a workout is key for you – if you’re doing a HIIT session (either in the gym or an interval run as part of a training plan) or basing your training around heart rate, for example. The readings from chest strap monitors are taken via electrodes, and are more reliable and recognise changes faster than those you get from wrist and armband trackers.

Wrist trackers are more comfortable and convenient to wear, though, and by keeping them on at all times you’ll get info on your resting heart rate – a helpful measure of your general cardiovascular health – plus more in-depth sleep tracking. Newer fitness trackers are also improving their accuracy during workouts, especially if you have a light, small device that sits snugly against the wrist and has the advantage of a screen to show you how hard your heart’s working. More advanced multi-sport GPS devices can also guide you through heart rate-based workouts.

Some wrist trackers are also now able to use their heart rate monitor to take a medical-grade electrocardiogram (ECG) measurement from the wrist. This can detect atrial fibrillation – an irregular heartbeat, which is a condition that’s worth getting checked out by a doctor if your device spots it. Trackers need a CE mark to be certified as medical devices in the UK to take an ECG, and only a handful have done this, including the Apple Watch, Withings ScanWatch and Fitbit Sense.

Armband trackers sit between wrist and chest strap monitors. They are optical heart rate monitors, like fitness trackers, but by positioning them on your forearm, upper arm or even around your thigh, you get a more reliable reading than on the wrist. They’re easier to slip on than a chest tracker and generally they are as accurate, but you don’t wear them outside of workouts so you can’t gain the benefits of knowing your resting heart rate or improved sleep tracking.

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