Flexion of the shoulder joint occurs when the humerus (upper arm) moves forwards from ... Ball and socket joints also allow types of movement called abduction, adduction, rotation and circumduction.

Abduction is any movement away from the midline of your body ... And if your chest adductors are weak, your arm would basically crash over your face when you try to raise your hand.

Deltoid Abduction of the shoulder (moving the arm outwards and away from the body) Outward arm action in a jumping jack Rotator cuffs A group of stabilising muscles of the shoulder which helps to ...