In Taiji we aim to generate all physical movement by turning the waist. Each movement starts in the dantien and ripples to the body part required to move. This passage of energy takes a little time so, when the body is relaxed and fluid, a lag develops between the action in the waist and the expression of that action in the arms and legs. We use this lag to create yielding holes and vortices that tug at the opponent's energy and tie them up in knots or rather entangle them in an elastic web.