The rear deltoid, also known as the posterior deltoid, is a muscle located at the back of the shoulder. It plays a crucial role in shoulder movements and stability. Functions: Extends and externally rotates the humerus (upper arm bone) Stabilizes the shoulder joint Assists in overhead and pulling movements It's important to train the delts to improves shoulder strength and stability, reduces risk of shoulder injuries, enhances posture and aesthetics, and supports overall upper body muscle develo

How To Fix Deltoid Muscle Tension!! | Physical Therapy Session