What do side arm raises work out?
What do side arm raises work out? The Lateral Raise primarily works the lateral deltoid, which is the middle portion of the deltoid muscle. The anterior (front) deltoid, posterior (back) deltoid, upper trap, supraspinatus (a rotator cuff muscle) and serratus anterior (muscles along your ribs under your armpit) also contribute to the movement. Are single arm lateral raises good? The lateral deltoid plays a key role in shoulder abduction and flexion. Along with the front and rear deltoids, this muscle allows you to move your arm up and down and to the sides. You may use one arm or both...