Sebastian Stan had to beef up to play the Winter Soldier, but initially he didn’t really know how to properly train in the gym.

He only had six months to bulk up, so he was introduced to Don Saladino, who famously trains celebrity clients such as Ryan Reynolds, and he helped get him into great shape.

But for follow up movies, his goal changed from looking good shirtless, to getting as big as possible, which caused problems for the costume department. He put on so much muscle between fittings, that they needed to create a new "metal arm" for him to make room for his new measurements.

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