Its also about being put in different situations mentally. We all know it takes a gifted athlete to play at the next level but it also take a certain mental toughness. Playing another sport be it Football, Soccer, Wrestling, etc all involve using your body and your mind. I also think by playing these other sports you also take away some of the repetitive use injuries we have been seeing occur at an alarming rate. Be it ACL, repeated concussions, elbow and many of the other surgeries we are seeing young kids get. Its good to take a break from all out competitive play in one particular sport and do something else. You never stop training but you get away from the daily rigors of just one sport and do something else to help develop physically and mentally.