- What you need is absolute comfort with the headstand, because of the extreme pressure at the shoulders and the elbows lift. The latter is where most people remain stuck -- when the elbows lift, they get scared and do the variations very timidly. You need to have no fear of falling backwards absolutely.
- A good pinchamayurasana and a scorpion also, so that you are prepared for the upper back and lower back curve when upside down.
- And of course a keen sense of adventure.