The Western States Endurance Run is an ultra-marathon which starts near Squaw Valley, California and winds 100 miles through the Sierra Nevada Mountains along an old gold miner's path. Qualifying racers only get one day to finish. No stopping. No sleeping. Just a pair of trail running shoes and the ability to ignore an unbelievable amount of pain. Competitors face 106 degree heat, 18-thousand feet of climbing, and dangers of running at night with small pins of light. That's like running over Mount McKinley, alone, with blinders on.