Hard to believe this guy once weighed 320lbs, David Clark is now and taking on the worlds toughest footrace! A video ride through the Badwater 135 mile Ultra marathon from the blast furnace of Death Valley to the lung-busting Mount Whitney.

The start line is at Badwater, Death Valley, which marks the lowest elevation in the Western Hemisphere at 280’ (85m) below sea level. The race finishes at the Mt. Whitney Portals at nearly 8,300’ (2530m). The Badwater course covers three mountain ranges for a total of 13,000’ (3962m) of cumulative vertical ascent and 4,700’ (1433m) of cumulative descent.

Herbalife 24 Prolong helped him get through the conditions and distance.