17 Rear Deltoid Exercises for Shoulder Growth. If you’ve been doing dumbbell shoulder press, barbell military press, or the Arnold shoulder press, you can stop struggling. While those exercises primarily target your anterior (front) deltoid muscle, you need to remember your shoulders are made up of 3 muscles: anterior (front), lateral (middle), and posterior (rear). - The Fitness Tribe | #TheFitnessTribe #Deltoidexercises #Shouldergrowth