Plot: As the world prepares for the 2012 Olympic Games in London, Oprah sits down with 10 legendary Olympians, including track-and-field stars Carl Lewis, Jackie Joyner-Kersee and Al Joyner; world-renowned gymnasts Bart Conner, Nadia Comaneci, Mary Lou Retton and Shawn Johnson; diver Greg Louganis; and world-record-breaking swimmers Janet Evans and Mark Spitz. Plus a bonus conversation with Bruce Jenner! These athletes open up about their triumphs, their untold stories and what happens after the glory