Hard/Soft. Some styles are considered "hard" and others are considered "soft." There is even one that is called "hard/soft" (Goju). It is important to use both concepts for overall development in sparring. As explained above, each technique should be soft and relaxed to generate speed, and should only be hard for an instant on impact. Also, there are times to meet a force head on, standing your ground and using direct power to defeat the force, and there are times to adopt a more yielding approach, perhaps to use the opponent's energy against him.
Fast/Slow. Many hyungs use combinations of fast and slow moves. Performing moves quickly helps to develop speed, while performing moves slowly assists with the development of focus of mind and body. Fast movements also help develop sharp reflexes and reactions, while slow movements enforce the development of correct techniques. The combination of the two helps develop rhythm, tempo, and control of the body. The ability to change rhythm and tempo is valuable, as it gives an element of unpredictability, and also makes the fighter more adaptable.
Unity. Ensure the hands and feet work together. Step and punch at the same time. Do not punch first and then step, or step first and then punch. All body movement should be controlled, concise, and purposeful. Unify the mind and body. Maintain your rhythm and timing, to keep the senses together and overcome any sense of panic or fear.