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 and wall sits, where the muscles are engaged but the body remains stationary. These exercises can be beneficial for rehabilitation and improving stability. They require minimal equipment and can be performed anywhere, making them accessible for various fitness levels. Isometric exercises are often included in strength training routines to enhance overall muscle performance and support joint health.