Changes

*During normal inhalation, an average person takes in about 500 cubic centimeters of air ; during deep inhalation the intake of air is about six times as great, amounting to almost 3000 cubic centimeters. The capacities of individuals vary according to their constitution. The practice of pranayama increases the sadhaka's lung capacity and allows the lungs to achieve optimum ventilation.

*The second chapter of the Hatha Yoga Pradipika deals with pranayama. The first three verse state: 'Being firmly established in the practise of asanas, with his senses under control, the yogi should practise of asanas, with his sense under control, the yogi should practise pranayama as thought by his guru, observing moderate and nutritious diet. When the breath is irregular, the mind wavers; when the breath is steady, so is the mind. To attain steadiness, the yogi should restrain his breath. As long as there is breath within the body, there is life. When breath departs, life also departs. Therefore regulate the breath'.