Shoulder extension is a movement that occurs when the arm is moved backward, away from the front of the body. This action primarily involves the latissimus dorsi, posterior deltoid, and triceps brachii muscles. It is essential for various activities, such as reaching behind the back or performing certain sports movements. During shoulder extension, the shoulder joint moves in a specific range of motion, allowing for increased flexibility and strength. Proper technique is important to prevent injury and ensure effective movement. Exercises that promote shoulder extension can enhance overall upper body function and athletic performance.