The posterior deltoid is a muscle located at the back of the shoulder, playing a crucial role in shoulder extension, horizontal abduction, and external rotation. It is essential for stabilizing the shoulder joint and is often targeted in exercises to improve posture and upper body strength.

Posterior Deltoid

Muscle located at the back of the shoulder

Shoulder extension is the movement that increases the angle between the arm and the body, effectively moving the arm backward. It is crucial for activities that require reaching behind the body or performing certain athletic movements, and involves the coordinated action of muscles such as the posterior deltoid, latissimus dorsi, and teres major.

Shoulder Extension

Horizontal Abduction

External rotation is the movement of a joint away from the center of the body, typically involving the rotation of a limb around its long axis. This motion is crucial in various physical activities and is essential for maintaining joint stability and range of motion.

External Rotation

Stabilizing the shoulder joint

Exercises to improve posture

Upper body strength refers to the ability of the muscles in the upper part of the body, including the arms, shoulders, chest, and back, to exert force. It is essential for performing everyday activities, enhancing athletic performance, and maintaining overall physical health and posture.

Concepts

Relevant Degrees

Your Lessons