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=Why is Hathyoga Important?=
Its numerous āsanas or fixed postures it first cures the body of that restlessness which is a sign of its inability to contain without working them off in action and movement the vital forces poured into it from the universal Life-Ocean, gives to it an extraordinary health, force and suppleness and seeks to liberate it from the habits. Robust health, prolonged youth, often an extraordinary longevity are attained.
Asana is used by the Rajayoga only in natural position, with the use of the mantra it brings the divine energy into the body and and facilitates concentration in Samadhi.<ref>http://incarnateword.in/cwsa/23/rajayoga#p7</ref>
The way for the ascent through the greater psychic being to the union with the superconscient Purusha can be done by Pranayama.<ref>http://incarnateword.in/cwsa/23/rajayoga#p6</ref>
=Different Schools of Yoga=