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What it all adds up to is that most of us permit our minds and our bodies to wage civil war upon each other instead of having them unite to serve us, and serve us well.
Clearly, then, the problem is to put our own selves in control.
Just how does the practice of Yoga, with its breathing exercises and formal postures, help to achieve this? On what physiological principles can it be said to base itself? Here are some of the answers the student should have before becoming more deeply involved.
First the physiology of breathing:
The purpose of breathing, as everyone knows, is to supply the body with oxygen and cleanse it of carbon dioxide. Cut off the oxygen, retain the poisonous waste gas, and death will follow in a matter of minutes. This is elementary. What is not so clear is that an inadequate supply of oxygen—that is, improper waste disposal—results in half-living. The body functions are slowed, the tissues fail to renew themselves. Yet this unsatisfactory state of affairs is so common that we actually take it for granted. In fact, leading chest specialists say that the average person today utilizes only about one-eighth of his lung capacity, a capacity which was right for him back in the days when he lived in caves and spent all his waking hours actively engaged in the business of surviving.
Even when we are not living at par, the heart does a prodigious job. Every hour it pumps some 800 quarts of blood through the lungs which, in turn, eliminate some 30 quarts of carbon acid during that time. The heart beats 100,000 times a day, which means it generates enough energy to lift a weight of 130 tons a foot high. It pumps enough blood in a lifetime to float the largest ocean liner. Imagine what power our heart might have, what energy it could generate, if only its supply of oxygen were increased eight times!
As the freshly-oxygenated blood travels from the lungs to the heart and is pumped on, via arteries and blood vessels, via tiny capillaries, it reaches every cell in our organism. It makes possible the utilization of our food intake for the body's various needs, rebuilding tissues, supplying energy. It stimulates the functioning of the endocrine glands so that their secretions may be better absorbed. It feeds the nerves. It feeds the brain. Then, through a second set of capillaries, dark red now instead of bright, for it is loaded with waste, it travels back through the veins to be cleansed once more. All of the blood in the body makes this trip to the heart every three minutes.
Related terms include free yoga and bikrams yoga.
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