Moving, with the body locked in as one unit, is the first step to effectiveness. One's ability to constantly change determines one's success as a martial artist. To be effective, one must have circular thought, not just linear. When one hits the air, one does not get used to stopping. The body should become one with its opponent's.
Hand takes out foot.
There is control in no control. Learn to run and strike without breaking stride. One starts with the potential to be as fast as a blink of the eye. Opponents cannot strike what they cannot perceive. Life and battle end to the mighty ovation of one hand clapping.