If you do preacher curls, spider curls, or wide-grip EZ bar curls, you will primarily target the short head of the bicep. If you do incline dumbbell curls, narrow-grip barbell curls, or Bayesian curls, you will primarily target the long head of the bicep. If you do dumbbell hammer curls, tricep bar curls, or rope hammer curls, you will primarily target the brachialis. | Pfau Fitness