One of the limiting factors in human physical performance is the amount of oxygen that is absorbed by the muscles from the bloodstream  Accordingly, entrepreneurs have begun selling at gymnasiums and health clubs bottles of drinking water, labeled SuperOXY,  that has extra oxygen dissolved in the water
Such water would be useless in improving physical performance, however, since <b> the only way to get oxygen into the bloodstream so that it can be absorbed by the muscles is through the lungs </b>
lack of oxygen is not the only factor limiting human physical performance