Many ask me whether pranayama ... postpones old age. Why worry about it? Death is certain. Let it come when it comes. Just keep working. The soul has no age. It doesn't die. Only the body decays. And yet, we must never forget the body, since it is the garden we must cherish and cultivate.
B.K.S. IyengarWe can wash the skin of our bodies with a bath, but through asana practice we not only purify our blood and cells, we are cleansing the inner body as we practice.
B.K.S. Iyengar