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Zac Efron joins Bear Grylls for shirtless adventure

Ab-tastic heartthrob Zac Efron teams up with Bear Grylls for an upcoming episode of the adventurer’s TV series “Running Wild.”

It seems Grylls may be aware that a lot of fans enjoy Efron’s frequent toplessness, since in the first clip released from the episode, the pair are shown stripping to the waist to abseil over a canyon.

As Grylls explains, the pair must take their shirts off and stuff them in their backpacks to “waterproof them” against the river below. We’re not sure that was ab-solutely necessary, but whatever you say.

We don’t claim to be abseiling experts, but seems to us that if you’re planning on rappelling down a jagged rock face, you might be better off wearing some form of skin-covering protective clothing rather than taking your top off.

“We’re going to do this together. We started together, and we’re going to finish together,” Grylls tells Efron.

In another clip from the episode, which airs in the US next week, Grylls is seen coaxing a clearly terrified Efron across a rope strung over a valley.

But in this one, Efron keeps his shirt on.

No word on an Aussie screening date for “Running Wild” as yet, but viewers will be pleased to know that Channing Tatum has also filmed an upcoming episode of this very important show.