Place your palms on the ground and the crown of your head in front of your hands close to a wall, forming a triangle with these three points of contact.
Flatten your back against the wall, place one knee above your elbow, and extend the other leg against the wall.
Put some pressure on your hands for stability; don't let your head take all the load.
Risks
This exercise puts a lot of pressure on the head. Make sure to warm-up your neck thoroughly before starting.