incredible, but the thing is, and I'm asking you at the same time Zinobi.. It al depends on your mind, if you aren't afraid and just give 100 % anyone should be able to do, (my friend that can do simular things told me this).. BUT the slighetest confusion or if you get scared ends up in neck injury... And hell I know that I would be afraid of do things like that..

Isn't it like that zinobi???

P.s You have to be well trained, al around the body, espacially the stomich to accelerate the backward movements!