Chris Hemsworth, 27, has an anti-dieting secret: eating non-stop he gained 20 pounds of muscle for his role in the action flick Thor, set to be released in May. "I feel as if I've been busy, but all I've been doing is eating all day," Hemsworth tells Men's Health. "Eating when you're not hungry and taking in that amount of food is exhausting. I ask myself, 'Why am I eating this chicken? For protein. Why am I eating this broccoli? For vitamins and fiber. Why am I eating this Ho Ho?' " Unlike most actors, Hemsworth was a newbie in the weight room before the film. "It wasn't until Thor that I started lifting weights," he says. "It was all pretty new to me."

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