He told Reveal magazine: "I'd have to make a lifestyle change if I wanted to do shirtless acting. But it seems like every single actor in the world is going a 'Taylor Lautner' scene - it's crazy. They have a scene where they walk out with like a 12-pack. It's like, 'Really?
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You're playing a normal guy! That doesn't make any sense.' But that's a prerequisite of being an actor. Or you can get fat!"
Robert also revealed he and girlfriend and co-star Kristen Stewart passed the time on the epic shoot of 'The Twilight Saga: Breaking Dawn Parts 1 and 2' by training their dog Bear.
He said: "We got a dog when we were filming 'Breaking Dawn' as there was a lot of waiting around. We were in Louisiana, so we spent time training him there."