(...) most of our fundamental attitudes to life have their physical counterparts in the body. Thus comparison and criticism must begin with the alignment of our own left and right sides to a degree at which even finer adjustments are feasible: or strength of will will cause us to start by stretching the body from the toes to the top of the head in defiance of gravity. Impetus and ambition might begin with the sense of weight and speed that comes with free-swinging limbs, instead of with the control of prolonged balance on foot, feet or hands, which gives poise. Tenacity is gained by stretching in various Yoga postures for minutes at a time, while calmness comes with quiet, consistent breathing and the expansion of the lungs. Continuity and a sense of the universal come with the knowledge of the inevitable alternation of tension and relaxation in eternal rhythms of which each inhalation and exhalation constitutes one cycle (…)

-- Foreword to Iyengar's Light on Yoga

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