Ball and socket joints also allow flexion and extension. Flexion of the shoulder joint occurs when the humerus (upper arm) moves forwards from the rest of the body, which happens at the end of an ...

Four important synovial joints used in most sporting actions are the elbow and shoulder joints in the arm, and the knee and hip joints in the leg. The elbow and knee joints are both hinge joints.

It is also where other ligaments come together to support the ball-and-socket joint, along with the rotator ... Gently lean your body forward, crawl your hands up the wall, and hold for 20 seconds.