Deltoid 3 Exercise Video
The deltoid muscle is one of the main ‘prime movers’ of the shoulder. It is composed of three general regions: anterior (front), middle (side), and posterior (rear). These ‘heads’ have greater/lessor roles in arm movements such as: flexion (forward), extension (backward), and abduction (out to the side). Training of this composite muscle is discussed in the video deltoid 3.