The Doctrine and Practice of Yoga Including the Practices...

(1) Stand erect. (2) Inhale a complete breath and retain same. (3) Extend the arms straight in front of you, letting them somewhat limp and relaxed, with only sufficient nerve force to hold them out. (4) Slowly draw the hands back towards the shoulders gradually, contracting the muscles and putting force into them, so that when they reach the shoulders the fists will be so tightly clenched that a tremulous motion is felt. (5) Then keeping the muscles tense push the fists slowly out and then draw them back rapidly (still tense) several times. (6) Exhale vigorously through the mouth. (7) Practise the cleansing breath. (8) The efficiency of this exercise depends greatly upon the speed of the drawing back of the fists, and the tension of the muscles, and, of course upon the full lungs. This exercise must be tried to be appreciated. It is without equal as a "bracer" as our western friends put it.