Concentration curl. An isolation exercise. Target muscle: Brachialis, not the Biceps Brachii! Synergists: Biceps Brachii (especially the outer or long head) and Brachioradialis. Visit site and read the Comments and tips to learn how the position of your elbow controls which muscle is the target.

Original article and pictures take http://weighttraining.guide/exercises/concentration-curl/ site