Mark Ruffalo has said he found it hard to get in shape for his role as a wrestler in the upcoming movie Foxcatcher, saying: "I'm too old to be doing this."
The Begin Again star told the New York Daily News: "We didn't have any heat in the gym, so it was always f***ing cold.
"We were always working out when we weren't shooting. We stayed in really humble hotels in places where there was not a lot of money outside of what you saw on the screen, so it was meagre and it was tough.
"You can't half-wrestle credibly on film. It's not like a stuntman throwing a punch. You have to go 100 per cent to make it credible, and so it was gruelling and it was taxing and I'm too old to be doing this!"
He added that the atmosphere on set was intense: "It was intense, it was dark. It wasn't a happy, sort of glib set. I think everyone took it very seriously, in part because everyone felt there was real responsibility to the story.
"Everyone sort of stayed away from [Steve Carell]. John du Pont was repellent, so the way they designed Steve's look, it made him repellent and you didn't know what to say to him or how to act around him. You never felt comfortable."
Foxcatcher hits cinemas on January 9.
