What's the first thing ER technicians put on your face after a major injury? An Oxygen mask. Did you suddenly forget how to breath the air everyone else is? Are you unable to get enough oxygen because you're injured (assuming your lungs are ok)?
None of the above. Oxygen reduces the stress your body will endure. Stress is an oxygen killer. Lack of oxygen kills cells and slows down brain function and other organs. We are all aging due to enzymatic systems failure which are responsible for the body's uptake and utilization of oxygen. If a cell is deprived of oxygen, it dies. If the cells die, you slowly start to die. If this happens often enough, you begin to age (and fast).
So why do you need to increase the oxygen during exercise? Isn't exercise the way to a long healthy life? Yes and no. Consistent strenuous exercise requires a great deal of oxygen. Your body burns the existing oxygen in your red blood cells, regardless of how much you are breathing in. It's not the quantity of O2, its the purity that is important. You are using far more oxygen than you are taking in. Your oxygen levels (pO2), measured in millimeters of mercury, should be between 85 and 100 depending on your age. Many doctors will advise that your low score "... is normal for your age." It's true that it's normal, but it's only normal because 99% of people don't know that it doesn't have to be low and you can keep it high where it belongs! Walk into any gym... notice how many people look great from the neck down? Why does everyone look older than they should? It's true they're burning calories and building muscle, but many are not aware they may be aging themselves at a greater rate and increasing the opportunity for many illnesses unless they are performing EWOT.
How are we getting more oxygen by increasing the saturation level we breathe normally?
A red blood cell carries no more than 97% oxygen. Many will argue that you cannot force another 3% into the cell. This is true. However, additional oxygen is absorbed by the plasma (which carry the red and white blood cells) and is then pushed into the body's cells & deep tissues without the aid of the red cells. This is called the Law of Mass Action. Very little oxygen actually gets through, but if you are consistently feeding your body the extra oxygen, there will be an extensive increase in your total tissue oxygen level. The goal is to keep the oxygen level of your blood at 100 points for your entire life.
Consult your physician or medical professional before exercising with oxygen.