"Ardha" means "half" in Sanskrit. Since the full posture is difficult to be practiced, the half-posture, which is easier, is followed widely. This posture was first promoted by the great Yogi Matsyendranath, one of the founders of Hatha Yoga, and hence the name.Bhujangasana - Cobra Pose
"Bhujanga" means "cobra" in Sanskrit. This asana is called "Bhujangasana" as the raised trunk, neck and head while practicing it resemble a cobra rearing its hood and about to strike, while the joined and stretched legs resemble its tail.Padahastasana - Hand-to-Feet Pose
"Pada" means "foot" and "Hasta" means "hand" in Sanskrit. You have to catch your big toes with your hands in this posture.
"Sukha" means "pleasant" or "comfortable" in Sanskrit. Any cross-legged sitting position which you find comfortable, in which the body does not shake and in which you can remain at ease for a long time, is called Sukhasana.Supta Vajrasana - Reclining Vajrasana
"Supta" means "asleep" in Sanskrit. "Supta Vajrasana" is lying down supine in Vajrasana.Ushtrasana - Camel Pose
"Ushtra" means "camel" in Sanskrit.Vajrasana - Adamant Pose
"Vajra" means "adamant" in Sanskrit. Sitting in this asana will provide firmness or stability to the sitter like that of an adamant person. Hence the name.