Jake Gyllenhaal Prince of PersiaBeefing up for a role definitely gets Hollywood talking -- just ask Jake Gyllenhaal, who had to turn into a hulk-like warrior for his role in 'Prince of Persia.' In an interview with Moviefone, he admitted that putting on all that muscle wasn't that big of a deal. "There was nothing hard about it, man, I was paid to get in shape," he said. Easier said than done, Mr. Gyllenhaal.

But were rigorous training and a strict diet the only factors contributing to his new washboard abs? Gyllenhaal's trainer, Simon Waterson, spoke with PopEater to reveal how the doe-eyed actor transformed his body in less than four months.