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Now what of the lungs? Why is it that most of us do not use our respiratory system properly? Partly the answer is, again, that we have grown effete with civilization. The physiology of the human body remains geared to that primitive state when man hunted, climbed trees, split rocks, and there is little we can do to change this. In a sense we now have too much equipment for our needs, and we are letting it grow weak and flabby with disuse. This imbalance, by the way, has been largely responsible for the prevalence of tuberculosis and our susceptibility to it until the development of wonder drugs changed the picture.
But the anachronistic way we are built is not the only reason for our being oxygen-starved, nor for the various respiratory ailments and infection from which so many of us surfer. The fact is, few of us breathe properly.
Look around you. You will be astonished to notice how many people breathe through the mouth instead of through the nose. This means they inhale directly through the pharynx and the larynx (roughly, together, the throat) allowing air to reach the bronchial tubes without being properly filtered and warmed. In order to be cleansed of dust and bacteria air should be drawn in through the nasal passages where the mucus membranes with their secretions filter it. Moreover, as that air then travels a considerably longer road it is warmed to body temperature instead of being allowed to hit vital organs with chilly shock. Breathing through the mouth, then, is an invitation to colds and infections of all sorts.
One final aspect, too often disregarded, of proper breathing is that it must be done from the diaphragm. Women especially, because of tight clothing and girdles, tend to breathe by lifting the chest, consciously drawing the air in. This is less than half-effective, both because the upper lobes of the lungs are the smallest and because the upper part of the rib cage is relatively rigid. The correct way to breathe is to expand the muscles of the diaphragm down and out, then push in and up. In this way the lungs expand to full capacity, air rushes into them, then is vigorously expelled. If you try it, you will quickly see how even a minute or two of such breathing can be enormously exhilarating. But very few of us breathe this way naturally. It is something which must be learned by practice.
Yoga deep-breathing exercises, as you will see shortly, give the body this exhilaration. Some you will find extremely simple—so simple you will wonder why they should be dignified by such formal attention. The answer is that because of this very simplicity they can, if done regularly, soon become automatic, a fine new habit. Moreover, like the more complicated ones, they are a most important adjunct of the practice of relaxation and concentration. Bear in mind always that one cannot be achieved without the other, and neither can be reached without an understanding of the purpose of both.
Related terms include yoga dallas and yoga shala.
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