8. Christian Bale: Batman Begins
Source: mirror
Christian Bale isn`t afraid of manipulating his body for different roles in movies. He dropped anorexic amounts of weight for his role as The Machinist. Christian Bale packed on a few pounds for American Hustle and got totally jacked up for Batman trilogy. Through combinations of resistance and core training, together with plyometrics, he gained the muscles he needed. Funny enough, his Director Christopher Nolan asked that he drop 20 pounds because he appeared too bulky.