Photo: 20th Century Fox/Warner Bros. Pictures/Promotional
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For his role in the 2004 film "The Machinist," Bale lost nearly 70 pounds, reducing his frame down to something that verges on skeletal. Even more astoundingly, Bale then promptly rebounded for his next project, "The Dark Knight." He bulked up from 121 pounds to 220 pounds in five months. That's either commitment or insanity.