BOF, I see that you have found some stuff that has worked for your son. My son is also a college pitcher, but that's not really what I'm talking about. A lot of things make intuitive sense. I'm kind of trying to stick to the science right now. The OP has been crucified here for not seeing and accepting what the science has to say. Scotty83 provided a different scientific perspective than those who are saying that any kind of distance running should not be done at all. Especially concerning the shorter distance running (under 5 miles). I'm just curious what those who are vehemently against any kind of distance running think about the science and definitions that Scotty83 presented in his post.