Check out a day in the life of Nastia Liukin here:
http://www.seehowtheylive.com/nLiukin.php
They advertised it over and over again during the Tyson American Cup lol. ..From At&T...It's really interesting.
Here's an overview:
she gets up at like 6:30, eats breakfast, goes to gym for like 4 hours until 12 or something, then 2.5 hours of school - 5 subjects, 30 minutes each (how does that work? guess it's more one-on-one?), then 3 more hours of gym to make 7 hours of workout per day.
there's a small tour of her house or mansion too - real nice!