Hatha Yoga Pradeepika - Asana

refer:
http://yog-knowledge.blogspot.com/2010/12/hatha-yoga-pradeepika-ch-1-po-2.html

Asana

Being the first accessory of Haṭha Yoga, âsana is described first in Hatha Yoga Pradeepika. It is practised for gaining steady posture, health and lightness of body.

Swastika-âsana.

Hatha Yoga Pradeepika says, Having kept both the hands under both the thighs, with the body straight, when one sits calmly in this posture, it is called Swastika.

Gomukha-âsana.

Placing the right ankle on the left side and the left ankle on the right side, makes Gomukha-âsana, having the appearance of a cow.

Hatha Yoga Pradeepika-Introduction

refer:
http://yog-knowledge.blogspot.com/2010/12/hatha-yoga-pradeepika-ch-1-po-1_26.html

Hatha Yoga Pradeepika begins with Salutation to Âdinâtha (Śiva) who expounded the knowledge of Haṭha Yoga, which like a staircase leads the aspirant to the high pinnacled Râja Yoga. Yogin Swâtmârâma, after saluting first his Gurû Srinâtha explains Haṭha Yoga for the attainment of Raja Yoga.Yogî Swâtmârâma discloses that he learned Hatha Vidhya from Matsyendra, Gorakṣa, etc., who knew Haṭha Vidyâ.

details here:

http://yog-knowledge.blogspot.com/2010/12/hatha-yoga-pradeepika-ch-1-po-1_26.html