Bicep exercises work the biceps brachii, a two-headed muscle on the front of the upper arm that lies between the shoulder and elbow. The exercises that target the biceps involve a simple curling motion. The primary difference between any bicep exercise is the angle at which the muscle is engaged and the type of equipment used. Bicep exercises can be grouped as follows: barbell/ez bar curls, dumbbell curls, cable curls, and machine curls. Below is a list of bicep exercises by type of equipment.