Get that enviable biceps bulge with the ultimate strength and muscle building move: dumbbell concentration curls. This basic bicep concentration curl exercises the brachialis muscle. The bicep concentration curl involves slowly and smoothly lifting a dumbbell up and down. While heavy barbell curls are the key to packing on major biceps mass, no exercise puts on the peak like dumbbell concentration curls. This article helps you to master the dumbbells in no time at all and pack that muscle on!