6. Christian Bale in Batman Begins and The Dark Knight series
Among the many Hollywood transformations through the years, what Christian Bale did for 2005’s Batman Begins might be the most impressive. Bale did the film The Machinist just before playing the Caped Crusader, and that role required Bale to drop 60lbs to play an insomniac character. After slimming down by eating tuna and apples, Bale jumped back into the gym, adding 100lbs to his frame using weight workouts, resistance training, and circuit training. In fact, director Christopher Nolan felt Bale had become too muscular for the role, and asked the actor to lose 20lbs again. Bale later bulked up again for The Dark Knight and The Dark Knight Rises, but what he did after The Machinist to get ready for Batman Begins will remain one of the most extreme—and impressive—transformations any actor has ever done.
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