I mean, some of these guys are 20 or 21 years-old so while they look like grown men, they still have a lot of growing to do. I'm sure someone like Miller came of of college with no hamstring issues and had no idea how to avoid them or what to do when he started having the problem. DAs approach might work with guys like AK, Demario, and Cam, but it's not necessarily work with younger players who haven't yet learned what it means to be a professional.