The whole system catches the vibration and becomes in harmony with the will, which causes the rhythmic motion of the lungs, and while in such complete harmony will respond readily to orders from the will. With the body thus attuned, the Yogi finds no difficulty in increasing the circulation in any part of the body by an order from the will, and in the same way he can direct an increased current of nerve force to any part or organ, strengthening and stimulating it.
The Hindu-Yogi Science Of Breath
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William Walker Atkinson