Bear Grylls, Channing Tatum strip down on 'Running Wild'

Bear Grylls and Channing Tatum go without pants on reality series Running Wild.
A preview of the 34-year-old actor's episode sees the star and Grylls backflip out of a helicopter into a lake and strip down to their undies to wring out their pants. "Now you're getting the full Magic Mike show," Tatum teases as the 40-year-old host reveals his Union Jack underwear.
Grylls and Tatum spent two days in the wilderness of Yosemite National Park. The series sees Grylls take celebrities on 48-hour survival adventures in remote locations around the world. Previous episodes featured Zac Efron in the Catskill Mountains and Ben Stiller at the Isle of Skye, and future guests include NFL Hall of Famer Deion Sanders, actor Tom Arnold (True Lies) and Today host Tamron Hall.
Channing Tatum's episode of Running Wild with Bear Grylls airs Monday, August 11 at 8 p.m. ET on NBC. The actor will next appear in Jupiter Ascending alongside Mila Kunis in 2015.