He's living on the edge!

In the latest clip from NBC's Running Wild with Bear Grylls, Zac Efron and the outdoorsman test their strength as they both go shirtless to rappel down a mountain!

The Neighbors star, who reportedly asked for the "biggest, baddest adventure," got just that as the 40-year-old host chose an area in the Catskills Mountains which was once used to train special forces in the 1800s for the series premiere.

Watch the clip to see what other things these two get into! The season premiere of Running Wild with Bear Grylls airs Monday, July 28.