Breathe pure oxygen during exercise. You will be breathing in 93% pure oxygen while on an exercise bike or treadmill, compared to in our ambient air which consists of only 21% oxygen and is filled with toxins and pollutants. Oxygen is one of the main healing elements as it inhibits the growth of infections and cancer cells. By increasing oxygen, our cells begin to oxidize toxins and eliminate them, regenerate cells, and rejuvenate tissues by delivering oxygen-saturated blood to damaged tissues in the body. Exercise becomes even more effective.