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Did you love the first Twilight movie? The sequel is already in the works, and Taylor Lautner fans will be happy to know that the actor will be back to play Jacob in the second installment.

Lautner's role in the second film wasn't a sure thing. His character, Jacob, a werewolf, grows a foot taller and looks 25 years old in the next movie. That's not an easy feat for a 16-year-old actor. To stay true to the role, Lautner has been working out for the past eight or nine months. He's packed on 26 pounds of muscle.

Lautner says, "I'm literally in the gym every single day for at least two hours a day." In addition, Lautner is eating as much as he can but he does try to keep it lean. It sounds pretty rigorous, but Lautner's no novice when it comes to fitness. Before acting, Lautner was active in competitve martial arts. Check out these early photos of Lautner from his martial arts days.

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