Peter Attia· MD
it is categorically a piece of garbage I would call it a random number generator for heart rate it can't come close to estimating my heart rate y there are times I look down and it says I'm at 170 beats per minute when I know I'm below 100 conversely there are times when I'm probably at 160 beats per minute and it says I'm at 110 so it as far as I can tell it serves absolutely no purpose