Is There a Quantitative Self for Athletes?

Some players don't want to have their heart re tracked and their effort tracked because thit seems too intrusive. Other people are opting into it. Do you think that this could be interesting for the league, to see people's heart rate? Lie, we've seen experiments with that aanother sort of a quantitative self. And matrick case, obviosly, that does have to do with rest and recuperation as well.