Isometric exercise involves muscle contractions without any visible movement in the joint angle. This type of exercise helps to build strength and endurance by holding a position for a specific duration. Common examples include plank holds, wall sits, and static lunges, where the muscles are engaged but do not change length. These exercises can be beneficial for rehabilitation, improving stability, and enhancing overall muscle tone. Isometric exercises can be performed anywhere and often require little to no equipment, making them accessible for people of all fitness levels. They are particularly useful for targeting specific muscle groups effectively.