Hi! Is it possible that the device isn’t measuring heart rate accurately in the first weeks? I was planning to do my usual Zone 2 run, but WHOOP showed I was in Zone 4, even though I was running at my usual recovery pace.
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A very common complaint on here. I have also been struggling with HR issues on my bike rides. Not sure if it’s a calibration issue, I can’t really see why whoop would would need any form of calibration. I have a support ticket open, I get days it’s good and days it’s bad. Hoping for a software update to fix it 
@MarinkaM Thanks for sharing your note. It’s normal for WHOOP to take some time to calibrate to your body, especially in the first few weeks. WHOOP uses your Max HR and Resting HR to calculate zones, and if those aren’t fully dialed in yet, it might show higher zones than expected. Double-check your Max HR in the app under More → Activity Settings → Heart Rate Settings and adjust it if needed. Also, wear WHOOP snugly, about 1 finger above the wrist bone, for the most accurate readings. Consistent use will help it calibrate.
If you decide you want to adjust your HR zones manually, you can. Take a look at this support article, which will tell you how to do that. Scroll down to the section that says “Adjusting HR Zones in the WHOOP App.”
Have a great weekend.
Got it - thanks for the detailed answer! Really helpful.
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I’m only on day 2 with WHOOP, so maybe we’re still getting to know each other . Glad I’m not alone though - hope it starts reading better soon!
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You’re very welcome @MarinkaM 
I asked support about could vibration affect the HR readings. Answer Yes, try to minimizing wrist movement during high-vibration activities can help ensure optimal tracking. Not quite sure how I do this but it could explain why lots of cyclists are having issues.
Other wrist based devices I have are not affected like this. I think Whoop needs to investigate this. I am hearing Whoop 4 doesn’t have these issues. Maybe the smaller, thinner 5/MG is affected more because of these changes.
I’m having absurdly high HR readings in my slow/gentle walks. No such issue with Apple watch,
Whoop is one to two fingers width above wrist bone and snug. Sensors are clean…
AW measured 72 bpm average and 92 max while Whoop 4.0 measured above 140 bpm for almost 1/3 of whole slow walk! :o
For cycling folks: I would consider upper arm/biceps band. There is less vibration there and more body to aid measuring.
Back to my walks. I have no idea what to do with it.
Perhaps it’s broken sensor? It’s one of this used 4.0 devices used for free trials.
I’m waiting for support reply. They initial response was according completely different issue which I guess was meant to someone else…
I hope I can resolve the super inaccurate HR issue as I really like the collected data analysis and presentation but it wont be worth much if it would be highly inaccurate.