Exercise & Oxygen…Your health depends on it Increasing the oxygen level in the blood is extremely important. All functions of the body are regulated by oxygen and must be replenished as our life energy depends on it. Oxygen energizes cells so they can regenerate. The body uses oxygen to metabolize food and to eliminate toxins and waste through oxidation. The brain needs oxygen each second to process information. In fact, all of the organs, in the human body, need a great deal of oxygen to function efficiently. The ability to think, feel, move, eat, sleep and even talk all depends on generated energy from oxygen.