Moving slowly combined with holding postures quickly builds muscular and mental stamina. The even nature of yoga, where movements and postures are balanced so that one moves left and right, forward and backward, up and down in equal proportion causes skeletal realignment by loosening joints and stretching muscles so that the bones can move into their natural position. When body alignment is improved toward its natural position then the light and graceful bearing of those with good posture is evident. A major focus of yoga is in deepening and lengthening the breathing pattern. The lungs are stretched and expanded by the respiratory muscles and the postures.
Many postures work specifically to open the chest, allowing a more efficient breathing cycle.
Improved respiration means improved oxygenation of the blood, which in turn improves cellular metabolic rates and efficiency to every organ of the body. All the bending, twisting and stretching movements also have a beneficial effect on the internal organs. Digestion is improved by yoga, not just by the actual movements and stimulating pressures applied but also by improved respiration and circulation. Some postures exert direct pressure on the kidneys helping to eliminate waste products. As yoga teaches our bodies to relax and be strong, it also teaches the mind.