It has become a standard practice for Hollywood actors to get ripped for certain roles.
But is Bradley Cooper breaking the records by being the guy who put on the most weight for American Sniper?
27kg + 18kg = 45kg
The Dark Knight (2008)
He famously lost 29kg for the 2003 film The Machinist and had to quickly put back 27kg for his Batman screen test.
After securing the role, Bale bulked up further to fully fill up his Batman suit.
He went from a scrawny sitcom guy in The Fresh Prince Of Bel-Air to leading Hollywood action hero for Bad Boys, but that was nothing compared to Smith's workout regime to turn into heavyweight champion Muhammad Ali.
The Dark Knight Rises (2012)
He was already quite fit and chunky as an MMA fighter in Warrior (2011) but Bane, the muscular juggernaut who broke Batman's back, was a different story altogether.
- PHOTOS: WARNER BROS, UIP, COLUMBIA PICTUR,
Playing a Norse God meant looking like one, so the Aussie worked hard to hone the Sexiest Man Alive beefcake image he's now known for.