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This picture taken on April 22, 2017 shows Brooks Entwisle performing hypoxic boxing training, in preparation for his attempt to summit Mount Everest, in Singapore. For decades, the dream of reaching the summit of Mount Everest has required at least two months on the mountain doing a series of acclimatisation rotations to get used to the harsh low-oxygen environment at the top of the world. Now pre-acclimatisation, which has been at the fringes of the climbing world for several years, is gaining traction, dividing the community between those who see it as yet another tool of modern mountaineering and purists who dismiss it as a gimmick. (Photo by Roslan Rahman/AFP Photo)
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