Christopher Hemsworth as Thor
Even before he was cast as Thor, Chris Hemsworth was in great form, but not enough to be mistaken for a Norse god. Few actors have been as eager to bulk up as Hemsworth, but his optimistic approach paid dividends. To transform from slim to buff, Hemsworth worked out with former Navy SEAL Duffy Gaver, who taught him bodybuilding techniques. Since Thor often doesn’t wear sleeves, the costume designers paid particular attention to Hemsworth’s upper body. He put on roughly 20 pounds, which he has kept steady. His wife is fortunate.