Make those guns grow! Aaron Marino of alpha m. demonstrates how to work the biceps effectively and appropriately with an isolated and concentrated movement. Break the muscle tissues down to build them stronger.
Grab a dumbbell or barbell that is not too heavy (can do 12x). Go find a solid wall to lean up against. Put elbows back, touching the wall. Lift up, pause, and down keeping your arm against the wall. All attention is on the bicep because of the tension. You are going to notice a huge difference.