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Updated: Tue, 02 Apr 2013 19:15:00 GMT | By Colleen Last
Muscle power: stars who've bulked up

Chris Hemsworth

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Thor star Chris Hemsworth has one of the buffest bodies in showbiz - just look at those arms!

But he didn't always look this muscly; check out our favourite celebrities who've bulked up, and take a peek at what they looked like before they hit the gym...