Julie, I'm glad you described that hanging in the air appearance, which I saw in a snatch of a Gay Burne show on TV, and haven't seen since. As they only showed the legs at that point, I couldn't be sure if it was due to the camera tracking, or real. And I had forgotten the arms when I tried to explain it to myself, with centres of gravity and so on. The only way I could think of through physics was for arms to be raised on the up, and then lowered rapidly to lower the centre of gravity at the beginning of the down, thus allowing descent without the feet going down for a moment. And you have removed that small hold on science. Back to the drawing board.