" (1) Sit erect, in an easy posture, being sure to hold the chest, neck and head as nearly in a straight line as possible, with shoulders slightly thrown back and hands resting easily on the lap. In this position the weight of the body is largely supported by the ribs and the position may be easily maintained. The Yogi has found that one cannot get the best effect of rhythmic breathing with the chest drawn in and the abdomen protruding. (2) Inhale slowly a Complete Breath, counting six pulse units. (3) Retain, counting three pulse units. (4) Exhale slowly through the nostrils, counting six pulse units. (5) Count three pulse beats between breaths. (6) Repeat a number of times, but avoid fatiguing yourself at the start. (7) When you are ready to close the exercise, practice cleansing breath, which will rest you and cleanse the lungs. "

― William Walker Atkinson , Science of Breath