Cooper bulked up naturally for film
Bradley Cooper has told how he bulked up naturally for his role in American Sniper, because he didn't want to use any other substances.
The Silver Linings Playbook star revealed to Vanity Fair that having struggled with addiction many years ago, he didn't want to take any stimulants to help him pack on the pounds to play former Navy SEAL Chris Kyle.
"I did it naturally because I've been sober for 10 years and didn't want to do anything," he said in the magazine's January 2015 issue.
He continued: "I had a realistic conversation. Can I do this in three months naturally? Can I gain 30 pounds of f***ing muscle? I didn't know if I would be able to do it or not. Thank God - luckily - my f***ing body reacted fast."
The film has been adapted from Kyle's book, American Sniper: The Autobiography Of The Most Lethal Sniper In US Military History. It tells the story of the expert marksman, who was killed by a discharged war veteran suffering from post-traumatic stress disorder.
Bradley revealed the loss of his dad to cancer in 2011 helped prepare him for the part in Clint Eastwood's movie.
"Losing someone close to me. Going through love and loss... knowing what's important," said the 39-year-old of his inspiration.
"Realising that the bottom line is that all I got is me, so it's about time to stop trying to be something that I think you would want me to be. Or that would give me what I think I need. As you get older, thank God, your body deteriorates, but your soul sort of flourishes."
Sienna Miller and Luke Grimes also star in American Sniper, which will open in UK cinemas in January 2015.