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There are actors who are willing to do some things for a role and there are actors who are willing to do anything for a role. Bradly Cooper is one of the latter.
Drastic body transformations are something that actors use to ensure the recognition of the movie and eventually themselves.
Bradly had to intake about 8000 calories per day to gain enough weight for his role in the American Sniper. Directed by Clint Eastwood, American Sniper is a movie about a real-life Navy SEAL Chris Kyle and to look the part Bradly had to train really hard.
This payed off since the movie had six Oscar nominations and Cooper was nominated for the Best Actor.