Abduction
Deltoids, Supraspinatus
Adduction
Pectoralis Major, Latissimus Dorsi
Flexion
Pectoralis Major, Anterior Deltoid
Extension
Latissimus Dorsi, Teres Major
Internal Rotation
Subscapularis, Latissimus Dorsi and Pectoralis Major
External Rotation
Infraspinatus and Teres minor
Horizontal Abduction - For the start position, lift your arms in front of you. The action occurs as you then move your arms out to the side.
Latissimus dorsi and posterior deltoid
Horizontal Adduction - From the starting position, lift your arms out to the side. The actions occurs as you then move your arms in front of you
Pectoralis major and anterior deltoid