Shoulder horizontal adduction

  • Deltoid

    Deltoid Muscle

    The deltoid muscle is used in all side lifting movements and any movement of the humerus on the scapula. It is divided into three portions, anterior, middle and posterior, with the fibres having different roles due to their orientation.

  • Pectoralis Major

    Pectoralis Major Muscle

    Pectoralis major is the largest and most superficial of the two chest muscles. Pec major and the anterior fibres of Deltoid work closely together. Pec-fly and push-up exercises work the Pectoralis major.