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Taylor Lautner packed on 30 pounds of muscle between the first and second Twilight films to reflect his character Jacob’s growth into a powerful werewolf. His eight-pack was the impressive result of serious weight training and a careful diet.

Of seeing Taylor’s bulked-up bod for the first time, co-star Robert Pattinson joked to Jimmy Kimmel (via The Improper), “I realized just having a pre-pubescent girl’s body wasn’t going to work for me anymore. I saw him and thought, ‘Jesus, I’m going to get fired.’”