Force is the effort one body exerts upon another and is directly related to motion. Motion only occurs through the application of force. Conversely, motion is reduced or stopped by the application of force.
Body force is generated by muscle contraction. The amount of force available for use varies inversely with the speed of muscle movement. The faster a muscle contacts during a movement, the less force is available to overcome a resistance. For example, you can pick up a heavier weight by lifting slowly. If you try to lift it quickly, too much muscle tension is used for rapid contraction and too little tension is available to lift the weight. When executing a Taekwondo technique, quick muscle contraction is used initially to develop speed of movement, but, as the blow nears the target, muscle tension is shifted toward overcoming the resistance of the target. If only a light resistance is expected, such as in light-contact free-sparring, more muscle tension may be reserved for speed. To transfer maximum force to the target, the body is tensed just as contact is made and is maintained for a split second after contact is made.
If a muscle is stretched, it will contract more forcibly than if it had not been stretched, but the stretching must occur immediately preceding the contraction. Fortunately, this naturally occurs as different muscle groups come into play.
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