Performing the: A Step-by-Step Tutorial Rear Deltoid Stretch
With your other arm, gently apply pressure on the elbow of your extended arm, pulling it closer to your chest until you feel a stretch in your rear deltoid.
Hold this position for about 20 to 30 seconds, making sure not to pull too hard and cause any discomfort.
Slowly release your arm back to its original position.
Repeat the same process with your other arm to ensure both sides are equally stretched.