Alas a few years ago I tore a ligament in my lower back. But before I did that I used to be able to lie on my back, raise legs and back into the air (shoulders and head on floor) bring my legs over my head and down so that my knees were on the floor behind my shoulders, then bring my head and shoulders up so I was in a kneeling position. Had to tie my hair back before doing this of course, or I'd kneel on it and get stuck.
I impressed quite a few people that way in my youth
