For really big arms, stop listening to the bro science and take a break from the preacher curl bench.Sure, curls are a great way to pump up your biceps and annoy everyone else trying to use a pair of middle weight dumbbells.For true gains and size, you need to cut back on your biceps, believe it or not, and concentrate on your triceps. Your squat rack-hogging, curl-head buddy might not want to hear it, but it's the truth, right down to the basic anatomy of your arm.