The Wrist and Elbow Extension Stretch is part of the Performance Plus Stretching Series. It is a really important stretch in maintaining arm health. Stand upright and prepare to start the shoulder stretch exercise. This exercise stretches the muscles in your upper arm, upper back and shoulder and can be performed either sitting or standing. Move your arm across your chest at the height of your shoulder. Use your other hand to gently hold your elbow and pull the arm a little further across. You should feel the stretch across the back of your arm and shoulder. Hold this position for 20 seconds and return to the start position and repeat to the other side. Complete twice each arm.