I also had problems with the hearth rate while exercising. On my left arm I had the Active 2 and on my right arm, an iWarch.  The Active 2 while exercising was systematically showing high hearth rate while the iWatch showing hea the rate I range I was expecting.  I solved the problem by attaching the band very tightly to my wrist. Since the Active 2 gives we HR within the range I was expecting and very close to the results from the iWatch @userzy32OQGlC5 wrote: I have the same issue with the Heart Rate. I am surprised that the same problem has been present for 2 years without a real solution. Isn't Samsung capable of making functional devices? The promises are not kept. When will we finally have a reliable solution. I also encountered a problem with the altitude which was no longer recorded. The only solution was to reset the watch. Very convenient! Samsung can you hear us? Can you finally offer an update to all of these issues? Thank you!   P.S. Do we have to go to Garmin to have a functional sports watch?   ... View more