Manav Dharam

How do padmasana place the right foot on the left thigh and the left foot on the right thigh , cross the hands behind the back and firmly hold the toes . press the chin  against the chest and look at the tip of the nose . this is called padmasana , the destroyer of a yogi's diseases's place the feet on the thighs soles upward palms in the middle of the groin facing upward gaze at the nosetip keeping the tongue pressed against the root of the upper teeth and the chin against the chest and slowly raise the upward this is called padmasana destroyer of all diseases . the yogi who seated in padmasana inhales through the entrances of the nadis and fills them with maruta or vital air gains liberation ; there is no doubt about it.

An important point which has been omitted by the commentators is that hath yoga is not only the union of prana and mind. In fact , it means the union of prana and mind with self. So , in hath yoga , ida nadi represents the negative force , the flow of consciousness,  pingala represents the positive force , the flow of vital energy , and sushumna nadi represents the neutral force , the flow  of spiritual energy.