Trainer to the Stars Answers Your Questions By ABC News January 9 • 13 min read   One Body One Life, Holistic Fitness Celebrity fitness trainer Gregory Joujon-Roche helped Tobey Maguire bulk up for "Spider-Man" and Brad Pitt get toned for "Troy." Throwback : Joujon-Roche answers your weight- loss and fitness questions. Question: Whenever I start working out, doing mainly activities that build muscle,...