The last time when I were here I learned to balance on wheelchair without having my front wheels on the ground. I can still do it. I just practiced between two beds, so I could not flip over. In the beginning it felt that I will never get it. But all of sudden it just snapped. I got it! Just lean back and there it is. The same thing I have heard about manual. Altought it has not happen.
I have to admit that manual on wheelchair without hands is still pretty hard core: