Sarvangasana is a very good form of yoga posture, which is a very important asana in Hatha Yoga. it improves overall body functions and is beneficial for all kinds of body related mechanisms.

Meaning :

Sarva means all anga means body parts and asana means posture. So Sarvangasana means a yoga pose for the entire body.

History :

Sarvanagasana is said to be existing since the time of ancient sages in India and has come a long way in making its position supreme in yogasana.

Technique :

First, take a deep breath and raise the back as well as the legs into a vertical position.
Now place the hands on the upper part of the back and rest the chin against the chest.
Now focus on your toes and continue breathing normally.
The waist, legs and back should be in one straight line at an angle of ninety degrees.
Inhale while releasing the position and exhale while bending at the waist.
Lower the leg over the head and then take off the hands from behind.
Inhale and bring the back down all the while keeping the legs at an angle of ninety degrees.
Exhale slowly and bring the legs to the straight position.

Benefits :

It improves the functions of the internal glands like pituitary, thyroid, and parathyroid and increases the flow of blood in the body.
Improves functioning of endocrine glands.
Improves supply of blood to the entire system especially to the eyes, brain, ears etc.
It improves the capacity of the lungs and provides the right kind of system to remove toxins from the system.
Aids in preventing varicose veins and detoxifies the body.
Relieves stress and eliminates fatigue.
Improves the Digestive capacity and has a positive effect on the body.

Care should be taken that people suffering from menstrual problems, Heart problems, high blood pressure should not do this asana.
Sarvangasana is a great form of release of unwanted energy thus curing all symptoms of asthma well.