Jake Gyllenhaal "Constantly Shirtless" on Film Set

Celebrity Body May. 6, 2010 AT 9:55AM
Jake Gyllenhaal "Constantly Shirtless" on Film Set Credit: Andrew Cooper/SMPSP

Jake Gyllenhaal knows how to keep it real. While filming Prince of Persia: The Sands of Time (out May 28), the actor, 29, stayed in character even after the cameras stopped rolling.

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"Jake would chat with crew and visitors in a British accent," a set source tells Us Weekly. "It was funny to hear this American guy talking in an accent when he wasn't shooting. He took it very seriously."

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Another thing the single stud took very seriously? Transforming his body with cardio and power circuits. "it's a very physical role," the actor -- who insisted on doing many of his own stunts -- admitted at the WonderCon comic book convention April 3.

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The hard work paid off. "He was very proud of the way his body looked," says a source. "He was constantly shirtless."

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