The heart rate during exercise is lagging behind vthe reality extremely. I had a medical checkup with the heart rate going up to 190 and the sense recorded 166. It is often reported that the heart rate measurement is quite good over long times, but not for short times. Intervalls etc. are not accurately measureable.
We need accurate heart rate data from the most expensive watch you have produced. It’s now 2021. Literally almost every other manufacturers have managed to get this spot on now. But not Fitbit.
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