May interest some runners.
https://www.runnersworld.com/heart-rate/normal-resting-heart-rate?utm_content=2017-11-30&utm_campaign=Rundown&utm_source=runnersworld.com&utm_medium=newsletter&smartcode=YN_0025954157_0001645938&sha1hashlower=b34acbbb488cc17027bbba911594dd01a6509a6f&md5hash=05b203cb4debf674b893ce980c0c7fa8