Watch: Roger Federer Runs Wild With Bear Grylls, Eats A Dead Fish's Eye - Sportswallah

Watch: Roger Federer runs wild with Bear Grylls, eats a dead fish's eye

Bear Grylls, the British adventurer has become somewhat of a celebrity with his incredibly popular shows in the past 'Man vs. Wild' and 'The Island'. The Adventurer is now in the middle of another hit show 'Running Wild With Bear Grylls' which is a survival reality show. The show has a new celebrity in different episodes and has already been graced by the likes of Kate Winslet, Kate Hudson and Barrack Obama.

In season 4, Grylls managed to get a very special guest on the show, tennis icon Roger Federer. The pair went on a survival mission on the Swiss Alps and Grylls made Federer eat a dead fish's eyeball while teaching him some basic survival techniques.

Watch the video for yourself.