So decided to buy a chest strap because I though my hr during run was way low (year off from everything, regarding work out - a bit smoking etc) so I knew for sure 140-150 avg was too low for me (Fenix 7ss btw) today I got a strap, well as you it’s something totally different lol, i know optical sensor it’s well optical and on my wrist but do you think that difference is logical ? Or my watch might have issues ?
