Can it work in some cases?
There is this black guy at my gym who is in there every day doing multiple sets of barbell and dumbbell curls, he does some lat pulldown but rarely works on anything else. The other day I saw his arms and they were fairly well built with vascularity...certainly bigger than some of the guys who do deads and squats...so can endless curls really build big guns in some cases? or is it just a waste of time?