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Watch a Shirtless Zac Efron Jump Off a Cliff with Bear Grylls

Leave it to Zac Efron to go shirtless on Running Wild With Bear Grylls.

The chiseled 26-year-old appears in next Monday's episode of the popular NBC show, and in this first clip previewing his adventure, the two decide to ditch their shirts while rappelling off an insanely high cliff.

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Dumping their backpacks in the water to ensure that they don't back out of jumping, even the thrill-seeing Zac is clearly a little apprehensive about the intense situation.

"I am ready as I'm ever going to be, man," he smiles nervously. "Let's do it brother."

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Running Wild With Bear Grylls featuring Efron scaling down New York's Catskill Mountains and skydiving amongst other extreme activities, airs July 28 on NBC.

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