for me. I am not suggesting that you come into the gym and grab the heaviest weights that you see, and your form in check for you as you use heavier weight. There is also just something about it that has always helped me build bigger biceps. When you're doing the preacher curl you can really feel it working. I've always felt it more than just doing curls standing up. Last but not the least are supersets and dropsets that help you to build big biceps. Supersets were very important for growing my biceps. I used to like to start with a heavy inward grip ECudaMax Z bar preacher curl for 10 and then superset with a wide grip EZ bar curl for 20 reps with a lighter weight. By the way 3.