MARATHON OF THE SANDS is the world's most daunting footrace - seven days and 148 miles of running in the merciless, 120 degree heat of the Sahara Desert, one of the most extreme environments on Earth. To some of those who dare, it's a transcendent foray into the timeless sands of Morocco. And to the rest, it's an awful test of the limits of human endurance. MARATHON OF THE SANDS captures the agony and ecstasy of this legendary race, as 600 of the world's fittest athletes compete against one another - and the Sahara.