"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.Dhanurasana - Bow Pose
"Dhanus" means "bow" in Sanskrit. In the final position of this asana, the body takes the shape of a bow, drawn tight to shoot an arrow. The stretched arms and lower legs resemble the taut bowstring, while the trunk and thighs resemble the wooden part of the bow.Makarasana - Crocodile Pose
"Makar" means "crocodile" in Sanskrit.Naukasana - Boat Pose
"Nauka" means "boat" in Sanskrit. The final position of this asana resembles a boat. Hence the name.
"Shalabha" means "locust" in Sanskrit. The final position of this asana resembles a locust when it lowers its head to eat and raises its tail. Hence, the name.Sirshasana - Head stand
"Sirsha" means "head" in Sanskrit. It is required to "stand on his head" in this asana and hence the name.