'Thor' Star Chris Hemsworth's Gains 20 LBs Of Muscle For Film

04/18/2011 12:01 pm ET | Updated Jun 18, 2011

It wasn't weightlifting that wore out Chris Hemsworth as he bulked up -- big time -- to star in Thor.

The actor, 27, says non-stop food consumption was the key to his 20 lbs. weight gain.

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