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Edward Norton
Norton's role as a scary neo-Nazi coming to terms with his past in 1998's 'American History X' earned him an Academy Award nomination. To get the look, Norton did squats, lifts, presses, pull-ups, among other muscle-shredding exercises.

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Better Off Shred: 12 Actors Who Got Ripped for Movie Roles

When you think of the ripped men of Hollywood, Jason Segel might not immediately come to mind. But in his new comedy, 'Sex Tape,' which co-stars Cameron Diaz, Segel shows that he's not the same guy that dared to bare all in 'Forgetting Sarah Marshall.' 'Sex Tape' focuses on a couple (Segel and Diaz), who accidentally upload an oh-la-la video to the mischievous cloud. Segel and Diaz spend quite a bit of screen time in the altogether, which apparently inspired Segel to get in shape. The actor joked on Jimmy Kimmel Live! that he needed to "look like a viable romantic partner for Cameron" for the movie's premise to work. He told Us Weekly, "I've just been living healthy, exercising, eating right — no more midnight pizzas. This time when I take my shirt off, I've made a promise to myself, it doesn't have to be funny." Segel isn't the only A-lister to get ripped for a role. Read on for a few more classic examples.