Set both pulleys to the top of the rack and put on the handles. Start with your arms out stretched (but ever so slightly bent), so your body is in the T position.
Curl the weights towards the head, keeping the upper arm parallel with the floor.
Squeeze like crazy while the biceps are pumped and then slowly unwind back to the beginning and just before the arms become straight start another rep.
Its kind of obvious why this one works so well, be cause when your hands are near your head, its that body building pose you see when bodybuilders flex their muscles in competitions.