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

(1) Walk with head up, chin drawn slightly in, shoulders back, and with measured tread. (2) Inhale a complete breath, counting (mentally) 1, 2, 3, 4, 5, 6, 7, 8, one count to each step making the inhalation extend over the eight counts. (3) Exhale slowly through the nostrils, counting as before 1, 2, 3, 4, 5, 6, 7, 8, one count to a step. (4) Rest between breaths, continuing, walking and counting 1, 2, 3, 4, 5, 6, 7, 8, one count to a step. (5) Repeat until you begin to feel tired. Then rest for a while and resume at pleasure. Repeat several times a day. You may vary the exercise by retaining the breath during a 1, 2, 3, 4, count and then exhale in an eight-step count. Practise whichever plan seems most agreeable to you.