Bradley Cooper has revealed that he "naturally" bulked up for his role of Navy SEAL sniper Chris Kyle in Clint Eastwood's upcoming 'American Sniper.'
The 39-year-old actor, who could use a little help for bulking up from stimulants or he could do it the old fashioned way by working out excessively and eating right, said that he chose the latter, E! Online reported.
The 'Hangover' star added that he did it naturally because he has been sober for 10 years and didn't want to do anything.
Cooper, who didn't know if he would be able to gain 30 pounds of f**king muscle naturally in three months or not, continued that luckily his f**king body reacted fast.
