Sarvangasana

The words ‘sarva anga’ denote the entire body. It is one of the very few postures that is advantageous for all the systems of the body, especially the head that houses the brain. This asana can be performed in the dynamic way as mentioned below or you can remain in the final posture for one to two minutes breathing normally.
-Lie supine on a mat with your feet together and hands at the sides. Inhale.
-Follow the same procedure as Ardha Sarvangasana and straighten your legs up vertically. Keep your entire body straight and point the toes towards the ceiling.
-While exhaling, raise your legs up together, toes to point towards the ceiling. The knees remain straight. Use your hands to support your body at the back as shown in the picture.
-The chin is set in the jugular notch. 

-Maintain this pose for a few seconds or as long as convenient but not longer than two minutes, the breathing slow, rhythmic and natural. 

-Slowly bend your knees, then, as you inhale, lower your hips towards the mat, releasing your hands from back, assume the starting position.
-Take a few deep breaths to compensate for the reactions of head low and hips high posture.
It is advisable to attempt this posture first in parts, and complete the pose only after a few weeks of initial training. What needs emphasis is the fact that this pose should never be attempted after any form of rigorous gymnastics because the abnormal rush of blood to the brain at this stage might do more harm than good. 
The physical benefits of this asana include strengthening of arms and shoulders, flexibility of the spine and nourishment of blood vessels in the brain. Therapeutic benefits include improvement in functioning of thyroid, parathyroid and pituitary glands; relief from congestion, through the rapid drainage of venous blood, in the abdominal and pelvic regions. There is a wholesome effect of gravity on the various organs of your body above the waist, including the vital endocrine glands.