Brand new watch. Had a vivo4 for a number of years. The Heart rate monitor does not seem to work properly. During an activity the HR is often around my resting heart rate.
I have noticed that f my arms are by my side eg when fast walking the HR is low. When I lift my arms up like in a running stance, suddenly the HR shoots up.
Another eg - a 4.62km walk in an hour - ave HR shows as 59 bpm.
i am not happy!