Thus the exercise requires us to take as much breath as possible, to retain it a moment, then slowly give it up and at last to relax completely the diaphragm, all the time sustaining the chest expansion. Preserve still the quadruple rhythm. Of course the exercise can be done with dual rhythm, and it will be helpful, but the accentuation of all four of the primary actions will accomplish more than double the beneficial results not only for health but for the voice. It develops the retental action of the breath. A true use of the voice demands a full chest. This exercise strengthens the muscles that reserve the breath and support the tone. The process of respiration is most directly necessary to all the actions of the human organs. It is an essential part of circulation. The breath we take meets the blood. The blood is carried from the heart through the lungs and back to the heart, then out through every organ of the body and back again to the heart. The whole circulation is a mighty process by which the blood receives sustenance, bears this to every organ of the body and carries back the refuse which is oxidized and given out by the lungs. The blood, according to the earliest tradition, is the life. All ancient writers on long life "regard the control of the breath as a fundamental sign." A person with little control of his breathing is doomed to a short life. Nature has so constituted us that at the moment of some excitement, or the reception of some impression, or the instant we try to do something unusual, we take a greater amount of breath. In any exercise, always allow the breathing to act freely. Observe that breathing is the initiatory act or condition of all human effort. It is a sign of the reception of an impression and is thus one of the conditional acts of expression. Breathe deeply and freely at all times. A deliberative breathing exercise, such as the preceding, strengthens all the respiratory muscles and corrects abnormal tendencies. 5. PRIMARY CO-ORDINATION IN LEVITATION Simultaneously lift and expand the summit of the chest as you actively extend the balls of the feet downwards. The opposition between the lifting of the chest and extending the balls of the feet takes place in all good positions in standing and walking. This exercise initiates or accentuates the co-ordination of the muscles used in standing. It tends also to harmonize and bring into unity all the conditions so far attained, and gives practical application to those parts of the body which are active all day, in standing, walking and in sitting. All exercises must be performed rhythmically. There are many elements in rhythm, one is activity and passivity, and another is the alternation of parts:--one limb is active and this helps alternation or rhythm. 6. HARMONIC AND RHYTHMIC EXTENSION