The following are the seven favourite exercises of the Yogis for developing the lungs, muscles, ligaments, air cells, etc. They are quite simple but marvellously effective. Do not let the simplicity of these exercises make you lose interest, for they are the result of careful experiments and practice on the part of the Yogis, and are the essence of numerous intricate and complicated exercises, the non-essential portions being eliminated and the essential features retained.
(1) The Retained Breath
This is a very important exercise which tends to strengthen and develop the respiratory muscles as well as the lungs, and its frequent practice will also tend to expand the chest. The Yogis have found that an occasional holding of the breath, after the lungs have been filled with the Complete Breath, is very beneficial, not only to the respiratory organs but to the organs of nutrition, the nervous system, and the blood itself. They have found that an occasional holding of the breath tends to purify the air which has remained in the lungs from former inhalations, and to more fully oxygenate the blood. They also know that the breath so retained gathers up all the waste matter, and when the breath is expelled it carries with it the effete matter of the system, and cleanses the lungs just as a purgative does the bowels. The Yogis recommend this exercise for various disorders of the stomach, liver and blood, and also find that it frequently relieves bad breath, which often arises from poorly ventilated lungs. We recommend students to pay considerable
