All professional athletes use supplemental oxygen to condition themselves. Regular people can add oxygen to their exercise routines and soon will to achieve better endurance and lose weight. People who are overweight can build up excess carbon dioxide because every cell in the body creates carbon dioxide. When there are too many cells, the balance between oxygen coming in and carbon dioxide being created in every cell gets off. A lack of balance creates carbon dioxide toxicity in the body. Supplemental oxygen is necessary to create a balance. Oxygen absorbs carbon dioxide and gets the gases inside the body back in balance. When there is an imbalance, the supplemental oxygen is needed, not too much supplemental oxygen, just the right amount.