Use your hips.

Short turning durations, that means strong rotation around the axis of the body, train for balance which is necessary to have during changes in direction! Bong Sau and Wu Sao have to become one unit, so that punching during Bong Sau becomes possible (Kwan Sao). Through explosive turning around the axis(Chum Kiu), high accelerating forces will occur. Overshooting with the arms can happen easily. Do not forget about the elbow. PhB