Vin Diesel said in The Fast and the Furious, "I live my life a quarter mile at a time... nothing else matters." He was talking about car racing when he said it, but this is the mindset many athletes take towards their sport. Every day they're not playing is a day wasted.
Sports can be extremely valuable in the growth and development of young people. However, it is up to us as the adults to do everything we can to make sure that what we want them to learn and enjoy from the experience are the very things that we are teaching them.