Joints are the place where two bones meet. Many joints just move back and forth like the finger and toe knuckles knees and elbows. Your shoulder though moves in a full circle.

Try it yourself! With your arms hanging down move your shoulders in a full circle: front up down back. Now try a full circle with your arms out. Feel the stretch in your muscles?

How can your shoulder move in a full circle? It has a ball and socket joint. The shoulder blade or scapula is a triangular bone in your upper back. It ends in a socket or cup shape just the right size for your arm bone.

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