Chris Pratt hopes his six-pack can save the universe in ''Guardians of the Galaxy''; we look back at others -- including Matthew McConaughey, Christian Bale, and Charlize Theron -- who reshaped their bodies to play a part
Gained weight for: Body of Lies
Lost weight for: Gladiator
Losing has been a winning formula for Crowe, who has publicly addressed his battles of the bulge over Twitter. Though his 63-pound puff-up for Lies (left) was a critical hit, the ripped and roaring role of Maximus in Gladiator (right) was the one that got him the gold.
Image Credit: Francois Duhamel; Jaap Buitendijk