I’ve been using WHOOP for over three years, and I can fully confirm that the heart-rate tracking from the wrist is absolutely inaccurate during running.
I compare my HR in real time with a Polar H10, a Garmin, and an Apple Watch — all of them consistently agree when I’m in Zone 2. WHOOP, instead, shows me at 165 bpm when I’m actually between 100–120 bpm. And it does this constantly.
Before anyone asks: yes, I wear the band correctly — tight, one finger above the wrist bone, fully flush to the skin, with no red or green light leaking. I’ve followed every recommendation, and after three years of daily use I know the device extremely well. So the issue is definitely not how I’m wearing it.
On a stationary bike WHOOP performs reasonably well, but during treadmill or outdoor running it becomes totally unreliable.
After 13 marathons, I know exactly what HR values to expect — and unfortunately WHOOP can’t be the device that accompanies me in training or racing.
I’ve already asked WHOOP to allow external HR devices (Polar, Garmin chest straps, or even using Apple Watch data) to feed heart-rate readings into the platform — that would completely solve the problem.
I have experienced exactly the same. Whoop 5.0 mesures my heart rate too high when I run. I believe it captures my cadence (160-ish) for 15-20 min until my I am warmed up properly. After that it is Ok but not really accurate. I must say I have the same problem with my sportswatch Polar V2. But I connect an external chest strap (armband OH1) and it is really consistent when compared to same exertion and wearing my Polar H10. I have tried it all with Whoop, wear i tight on my wrist or my biceps. It doesn’t matter, it is still inconsistent. I have less problems when doing others sports. If you find a solution for running, please send me a message.
Same for me. The first 10-15 minutes show my HR at 160+ and then it drops down quickly and closely matches the heart rate strap I wear with my Garmin watch. It does not matter if it is an outdoor run or a treadmill run. Should I be wearing the sensor somewhere else on my body for more accurate results? Currently using wrist band 24/7.
Some get better result worn on the bicep. Not me. For me the best way to wear whoop is with three fingers width from the wrist bone. It is not perfect but the best way for me.