sentences:  Another extraordinary aspect of his accomplishment is that Nawang chose not to do any physical training before the expedition, as he was concerned about possibly damaging his knee or prosthetic leg.In addition, nausea during his summit push prevented him from eating during the three-day climb up to the summit and the two-day descent back to basecamp.During the April 2006 Friendship Beyond Borders expedition, Nawang made a partial ascent of the sixth highest peak in the world, Cho Oyu, on the Nepal-Tibet border about 12 miles from Mount Everest.