This is a nice stamp released with Yoga as a theme by India.
The name 'Bhujangasana' comes from the Sanskrit words bhujanga meaning "snake" or "serpent" and asana (आसन) meaning "posture" or "seat". This pose is also famously known as the 'Cobra Pose' and is very beneficial for the back, spine and is supposed to be very helpful for digestion.
For more , head to this wikipedia article.