are shows on about the rigors of gymnastics training. It usually focuses on the girls since their window of athletic opportunity seems to be smaller than the men's. As far as I know, unless they live near their coaches the best of the best usually give up everything and move to their training center far away from their families, where they work for many hours a day. They are tutored in order to keep up on schoolwork. I am sure you can google articles on this. Someone writes one every so often. :) You can also go to the
http://www.usa-gymnastics.org/ or
http://www.insidegymnastics.com/ websites and see what you can find there.
My experience with gymnastics is very small at this point. My kids have only been doing recreational stuff for a couple of years. I have some experience in training cheerleaders for tumbling, but again at the beginner's level (up through handsprings).
http://aescougarcheer.com/Cheer101/tumbling.htm