Standing with the left foot behind in passo naturale, as seen in the figure for the passo indietro, lift the said left foot from the ground, and draw in backwards through the air, as if you want to do a passo naturale, and without putting it on the ground return it to the front, and put it back where it was when you first lifted it. It is so called because you pretend to go backwards. This can also be done per contrario.