Hi,
I bought my Fenix 5S watch a few days ago. I went on an intense bike ride but the watch only showed that I was warming up at 100bmp.
The historical heart rate for the exact same ride was around 160bmp. My husband's fenix 5x showed his rate was 170bmp.
I adjusted the watch on my wrist. I also tried to take it off and put it on again. None seemed to work. After 2 hours of an intense bike ride, my heart was still recorded at 90 - 110bpm which is unreasonable.
I used Apple Watch before and felt disappointed in seeing inaccurate heart rate reading from my brand new Garmin watch.
