Best wearable for athletes
Athletes push wearables to their limits, and that is where most of them fall short. Here is what works for training, and what to use if your heart is the question.
From Dr. Kenny Civello, cardiologist and electrophysiologist
Reviewed October 2026. Prices as of that date.
A chest strap gives the most accurate heart rate in a workout. A watch with an FDA cleared ECG watches for AFib between workouts. A recording right after symptoms is what helps us most if your heart races or skips.
Fainting or chest pain during exercise needs a visit before a new device.
My picks
FDA cleared means the FDA reviewed that feature for that use. Wellness means it was not reviewed. How I choose
KardiaMobile 6L
Record as soon as you stop. Six views of your heart, and the recording is what we need to see.
- FDA clearedSix lead ECG
- FDA clearedReadings for normal rhythm, AFib, slow, and fast heart rates
Skip it if you faint or have chest pain with exercise. See a doctor first.
kardia.comApple Watch Ultra 4
FDA cleared ECG plus rhythm alerts in the background, in a watch built for training.
- FDA clearedECG app
- FDA clearedIrregular rhythm alerts, which check while you are still
- WellnessTraining load, heart rate variability, and readiness
Skip it if your resting heart rate is often under 50. ECG readings may come back inconclusive. Save them anyway.
apple.comGoogle Pixel Watch 5
FDA cleared ECG and rhythm alerts, plus Loss of Pulse Detection.
- FDA clearedECG app
- FDA clearedIrregular rhythm alerts
- FDA clearedLoss of Pulse Detection
Skip it if you need multi day battery for long events.
store.google.comGarmin Forerunner 970 or fenix 8
A training watch with an FDA cleared ECG app.
- FDA clearedECG app
- No background rhythm alerts. You have to record yourself
- WellnessTraining readiness, heart rate variability status
Skip it if you want alerts without remembering to record. The Forerunner 570 has no ECG.
garmin.comPolar H10
A chest strap reads the heart's electrical signal directly. It is the reference strap in most accuracy studies.
- WellnessHeart rate and heart rate variability
- Pairs with most watches, bike computers, and apps
- Works for swimming
Skip it if you want a medical reading. It is not FDA cleared for anything.
polar.comWHOOP MG
Recovery and strain scores, with an FDA cleared ECG you record when you feel something.
- FDA clearedSingle lead ECG with AFib detection
- WellnessRecovery, strain, and sleep
Skip it if you will not remember to record. In the US it will not alert you on its own.
whoop.comCompare
| Device | Best for | FDA cleared heart feature | Price |
|---|---|---|---|
| KardiaMobile 6L | Palpitations, record right after | Six lead ECG | $96 to $129 |
| Apple Watch Ultra 4 | Endurance athletes on iPhone | ECG, rhythm alerts at rest | $799 |
| Google Pixel Watch 5 | Endurance athletes on Android | ECG, rhythm alerts, Loss of Pulse | $399 to $529 |
| Garmin Forerunner 970 | Garmin training | ECG app only | $749.99 |
| Polar H10 | Accurate heart rate | None | $104.95 |
| Garmin HRM 600 | Garmin users who swim | None | $169.99 |
| Polar Verity Sense | Heart rate without a chest strap | None | $104.95 |
| WHOOP MG | Recovery plus ECG | Single lead ECG | $359 a year |
Know before you buy
Wrist heart rate fades as you push
In studies, wrist sensors read lower as intensity rose, and high intensity moves like burpees threw off every optical sensor tested. A chest strap stayed accurate.
Rhythm checks do not run mid workout
Watch AFib alerts check while you are still. They will not catch an arrhythmia during a run. Record right after.
A low resting rate can block a reading
Watch ECG apps only classify between about 50 and 120 to 150 beats a minute. A fit athlete in the 40s may get inconclusive. We can still read the tracing. See My watch ECG says inconclusive.
Low heart rate alerts and athletes
Watches can alert for a resting rate that is normal for a trained athlete. Most let you adjust the threshold in settings.
Endurance training and AFib
Years of high volume endurance training raise AFib risk, more in men. In one large study of skiers, women had less AFib and all skiers had fewer strokes. Do not stop exercising. See Lowering your AFib risk.
Heart rate in AFib
During AFib, wrist sensors can read far lower than your true heart rate. In one study they were off by about 30 to 70 beats a minute when the true rate was over 100.
Common questions
Is a chest strap worth it if I have a watch?
For hard intervals, cycling, and lifting, yes. It pairs with your watch and gives you an accurate number.
Can my watch tell me my heart is safe to train?
No. A wearable cannot clear you for sports or rule out a heart problem.
What about teenage athletes?
Every FDA cleared rhythm feature on these devices is for adults 22 and older.
More on wearables
My watch says I have AFibMy watch ECG says inconclusiveHow I choose the wearables I recommendFind the right wearableBest smartwatch for catching AFibBest smart ring for sleepBest home blood pressure monitorBest personal ECG without a smartwatchBest wearable for an older parentBest wearable without a screenThis guide is general education for my patients. A wearable is not a diagnosis. Talk with your doctor about what your data means for you.
No affiliate links. I have not received payment from any company for these recommendations. See how I choose.
Heart rate straps, recovery scores, and training metrics are wellness features, not medical devices.
FDA cleared rhythm features on these devices are for adults 22 and older.
A wearable does not clear you for sports or rule out a heart problem.
Sources: Gillinov S, et al. Variable accuracy of wearable heart rate monitors during aerobic exercise. Med Sci Sports Exerc. 2017. Boudreaux BD, et al. Validity of wearable activity monitors during cycling and resistance exercise. Med Sci Sports Exerc. 2018. Bent B, et al. Investigating sources of inaccuracy in wearable optical heart rate sensors. npj Digit Med. 2020. Moghaddam et al. Sensors. 2025. doi:10.3390/s26010176. Al-Kaisey AM, et al. Accuracy of wrist-worn heart rate monitors for rate control assessment in atrial fibrillation. Int J Cardiol. 2019. Newman W, et al. Risk of atrial fibrillation in athletes: a systematic review and meta-analysis. Br J Sports Med. 2021. Svedberg N, et al. Long-term incidence of atrial fibrillation and stroke among cross-country skiers. Circulation. 2019. Lampert R, et al. 2024 HRS expert consensus statement on arrhythmias in the athlete. Heart Rhythm. 2024. FDA 510(k) K221774, De Novo DEN180044 and DEN180042, 510(k) K242967. Maker specifications as of October 2026.