18) Christian Bale

The most extreme physical transformation, of course, is reserved for roles such as American Psycho or The Machinist. For Batman Begins, Christian Bale added massive amounts of muscle, combining strength training with intense cardio to yield the Dark Knight's physique. His commitment to the project often includes very rigid dieting plans to add to the intensity of the training. His acting requirements are paramount, especially in films such as The Fighter, in which he included boxing and conditioning drills in his rigorous training regimen.
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Edited by Sugnik Mondal