In this photo released by Himalayan Expeditions, a mountaineering and adventure travel outfitter company, participants of the annual Tenzing Hillary Everest Marathon begin the race at the Everest Base... more 
In this photo released by Himalayan Expeditions, a mountaineering and adventure travel outfitter company, participants of the annual Tenzing Hillary Everest Marathon begin the race at the Everest Base Camp, Nepal, on Sunday, May 29, 2011. The event, considered as the highest altitude marathon of the world, starts at Khumbu Ice Fall at Everest Base Camp at 5,364 meters above sea level, finishes at Namche Bazar at 3,440 meters above sea level. less 
1 / 1
Associated Press | Photo By Himalayan Expeditions
Sun, May 29, 2011 9:18 AM EDT