Only when the leverage and the deltoid are removed from the equation can the bicep work completely. That makes steep incline curls the ultimate biceps builder. (As a matter of fact, Steve Reeves did ONLY incline curls for biceps and I think he knew something a lot of us didn't). When doing standing barbell curls, the elbows must stay BACK in order to utilize the complete range of motion for the biceps. Of course, you can't lift as much, because it's harder -- but that's the idea. You want to impress the guy next to you, or do you want to grow?