Place your hands on your shoulders, then slowly raise one hand as high up as comfortable reaching like you would for something on the top shelf.
Return to the starting position on the shoulders, and repeat with the other hand.
Maintain good standing posture throughout.
Put your hands on your shoulders, elbows pointing forward as much as possible. Slowly move your elbows out to the side, pinching the shoulder blades together and hold for 5 seconds. Bring your elbows back to the starting point in the front and repeat.