Oxygen is essential for human life because it powers cellular respiration, the process of generating metabolic energy (ATP) from nutrients. Through aerobic metabolism, cells use oxygen to convert glucose into efficient energy, while a lack of oxygen causes fatigue and forces the body to switch to less efficient anaerobic energy production.

Wim Hof intermeadiate level 3 rounds

Wim Hof advanced level 4 rounds

Wim Hof Expert level 3 rounds 3 min hold