Guardian - On the night of his 30th birthday, after a few drinks, Dean Karnazes decided that he would celebrate by running all the way from San Francisco down the coast to the town of Half Moon Bay, a distance of 30 miles. So began a career as an endurance runner. He has run 50 marathons in 50 consecutive days in all 50 states, and taken part in such extreme competitions as a marathon to the South Pole and a 135-mile race through Death Valley, one of the hottest places on Earth. Karnazes once ran 350 miles in 81 hours and 44 minutes, without stopping to sleep. His account of his feats of distance running, Ultramarathon Man, is a bestseller. Karnazes’s superhuman exertions are sponsored by The North Face, the company that make the kit he wears in his coaching videos.