Who Is Bear Grylls?

As per Metro, Bear Grylls — the 46-year-old wilderness survival expert — pushes the celebrities on his show, "Running Wild with Bear Grylls," to the extreme. The hit show has featured an array of celebrities, from Kate Winslet and Courteney Cox to President Barack Obama. According to The Sun, Grylls shared that he wasn't always as in shape as he is now, and grew up as a "scrawny kid" who was not naturally fit. He explained, "I am not one of these people who is naturally fit, naturally super-positive. I never have been. I know I need motivation and encouragement."

As per Forbes, the current season of "Running Wild with Bear Grylls" as of publication airs on National Geographic at 9 p.m. EST. Each week, the adventure junkie is joined by a different celebrity, who partners with him to conquer their fears while taking an extreme adventure. Forbes noted that during the season, Grylls will be joined by the likes of Terry Crews, Rainn Wilson, Danny Trejo, Danica Patrick, Anthony Mackie, Keegan-Michael Key, and Bobby Bones with his fiancée Caitlin Parker.

When asked by Forbes what the main message of the show was, Grylls said, "I think that my main message is to show people that they can truly do anything and to never give up."