There are three types of muscle contraction.The first is when a muscle (a fiber, a motor unit, or the muscle as a whole) is activated, it attempts to shorten itself. It attempts to contract and exerts force. Whether the muscle actually becomes shorter depends on many factors. But the force is still being generated as long as the muscle is trying to contract. The second is Static/Isometric. Static, or isometric, muscle contractions occur when the muscle is activated, but the muscle stays the same length, neither lengthening nor shortening. This happens quite often. The third is Dynamic/Isotonic (Concentric and Eccentric). Dynamic, or isotonic, muscle contractions occur when the muscle contractions cause movement. And whenever there is body movement,