We all know that growing up, a good amount of excersize and a good diet helps you grow overall. Why would this be any different for the penis? I'm not saying that every guy who weightlifts is going to get an 8 inch penis, but still, if a guy was genetically predispositioned to have say a 7" penis, but was never physically active so he kind of let his body wither away, would his penis experience some level of dystrophy as the rest of his body might? Isn't it said that proper excerise in males releases testosterone? could lack of this cause the penis to not grow to it's genetically potential size?