Hi, This is a strange thing to post on MR but I'm not really involved with any other forums so short of signing up for a health related one to post only this, you guys are my best option! I recently got a fitbit charge HR and I've been rather intrigued by my heart rate under various activities. I know the recommended resting heart rate for adults is 60-100, with lower being fitter. Now I'm 21 and by no stretch of the imagination am I fit. I'd like to think I'm not super unfit either but I don't do much exercise, I ride my bike maybe 1-2 times a week and walk to and around uni (I'd estimate about 30 minutes/day max), and my breathing gets a fair bit heavier just after 10 minutes of walking at a medium-fast pace. With all that in mind, I would expect my resting heart rate to be around 80-90 minimum, but it is in fact always around 50-60. Could this be a problem? We've pretty much ruled out great levels of fitness as the reason for my low heart rate, could it be something more sinister? I'm honestly not hugely worried (otherwise I'd actually make a doctor's appointment) but it would be nice to know if there could be something I ought to be looking out for. Cheers!