BillaTraining relied on COSMED K5 to assess and train Marc Batard, World Recordman of the ascent of Everest, without oxygen, in less than 24 hours. The French mountaineer will take up a new challenge in 2022: climb Everest again, but this time at 70! Marc Batard, during his exceptional career, noted the lack of training at very high altitude for mountain professionals. In his opinion this is...