You've all seen this trick done before. A woman lays down on a board, propped up by two chairs. The chairs are taken away, and the board miraculously stays in the air. A hoop is then pulled along the woman's body to prove that she isn't being held up by wires.
In this trick, the hoop is actually a distraction. It keeps you from staring too hard at the position of the magician, who's standing in the way of a steel beam that is holding the board in place.