Isometric contraction is a type of muscle contraction where the muscle generates force without changing its length. This occurs when a muscle is activated but does not shorten or lengthen, such as when pushing against a stationary object. It helps maintain posture and stabilize joints. During isometric contractions, the muscle fibers are engaged, but there is no visible movement. Common examples include holding a plank position or pressing against a wall. Isometric exercises can improve strength and endurance, making them useful in rehabilitation and fitness routines.