sarvāṅgāsana

Shoulder stand – sarvāṅgāsana – सर्वाङ्गासन

The safest and easiest way to approach this pose is this:

Get as close to the wall as you can before lifting up! Take your time and allow your body to get used to being upside down. If there is any distress, come down at once. The pose should be restful and sustainable. If you have blood pressure problems, be very slow and careful.

Important! The tiny bones in the neck should not take weight in Shoulderstand. The weight should be distributed between the back of the skull and the tops of the shoulders. This provides a perfect triangle to take the weight and you can lift the neck vertebrae off the floor at will.
There are many movements and variations you can do in shoulderstand. The pose strengthens the abdominal muscles as shown below. You can also arrange props to do the pose passively.

Mr Iyengar heaps praise on shoulderstand. In “Light On Yoga” (1964). He says “if a person regularly practises sarvāṅgāsana he will feel new vigour and strength, and will be happy and confident. New life will flow into him, his mind will be at peace and he will feel the joy of life.” LOY pp 137.
The full quote is here

There are many variations and movements you can do in Shoulder Stand. Here’s a few.