Shoulder Pectoralis Stretch
This is important stretch that helps improve your posture, your shoulder mechanics, and even help with neck pain.
Start: Stand next to a doorway. Lift your arm to 90 degrees so your palm is on the frame. You can place your arm lower if there is shoulder pain. You should feel a gentle pull on the chest wall. Now twist your body to the outside to increase your stretch. This should be pain-free. Hold for 30 seconds.