INTRODUCTION
The best description of hath yoga is found in hath yoga pradipika. Hath Yoga Pradipaka is written by swami Swatamaram ji the time for the written of hath yoga pradipaka is about 1360 to1650 (studies in Indian literary history).

In order to purify the mind, it is necessary for the body as a whole to undergo a process of absolute purification. According to hatha yoga there are several energy channels in the body, which are knows as nadies. When you clear the body of these impurities, the nadis function and the energy blocks are released. Then the energies move like wave frequencies throughout the channels within the physical structure, moving right up to the brain.
Yoga has proved to be very effective in the treatment of many impossible and incurable diseases, the therapeutic effect of yoga is only a byproduct and incidental.In order to make the subject clear, it was termed hatha, i.e. ha and tha yoga, a combination of two beeja mantras. It has been explained in hatha yoga that ha represents prana, the vital force, and tha represents mind, the mental energy. So hatha yoga means the union of the pranic and mental forces. when union between the pranic and mental forces takes place, then a great event occurs in man. This is the awakening of higher consciousness.