When I started on it, my head is to be far lower, plus the back leg also. It was only when I took a photo of myself I realised that the knee was bending limply! And so lifting and straigthening the leg (which comes from the upper back and arms) finally pushed me higher. But I see that it can keep going up higher and higher as ur arm strength grows steadily.
Preparation: Peacock and the crow poses.
Difficulty: U can crash on your face if you don't get all the details in, before lifting up.
Co-ordination required: for straigthening the back leg out, plus the right placement of the thigh (folded leg) on upper arm, plus the elbow-stomach contact which holds the body up.
Wobble factor: High, till you suddenly lift up higher. Once u reach higher it becomes progressively steadier which explains my belief, that great muscles make the body light...