In mountaineering, it refers to mountain climbing activities that increase adaptability. When climbing a mountain above 6,000 meters above sea level, due to the large difference in elevation, various organs of the human body cannot immediately adapt to the hypoxic environment of the mountain, and it is difficult to climb directly from the base camp to the top. In general, more methods are used to adapt to the increase. For example, starting from a base camp of 4,000-5,000 meters, after several marches to a height of 6,000--7,000 meters and a certain degree of adaptation, it is raised from the base camp to more than 8,000 meters to meet the high altitude. Highly oxygen-free environment