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.