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But Mark Ruffalo has been through the pain of toning up his body before - he followed in his dad's footsteps and won medals as a student wrestler.

He tells E!Online, "They (film bosses) want me mean and lean, but they don't want me big and buff. I gotta keep building and building and building. You have to eat to build muscle."

"I was a wrestler. I'm used to starving myself. It's easy for me. The last two weeks you just walk around spitting into a cup."