They aren’t working at all. Is anyone else having this issue?
As seilogramp wrote, the official document should give you some clues. Briefly told there are two principal reasons:
You did not reach or exceed 10 consecutive minutes where your HR is elevated above the threshold that is considered moderate intensity.
You do not wear the watch 24/24, hence the average Resting HR is rather high. And since the ratio HR/RHR is used for the calculation of the threashold, you'd need to get your HR very high to get into the intensity zone
