"Do not move your body while taking heart rate measurements. Doing so may cause your heart rate to be recorded inaccurately."
- at samsung.com
It appears this is not a HR monitor for active use.
I'm very frustrated trying to make my watch display my heart rate constantly during exercise the screen keeps turning of or going to always on display (no HR there), I don't need to see anything else while exercising, only this trivial thing thx