@leppanphysiques: I've watched men curl forty kilos with everything except their biceps for years. Shoulders heaving, back swinging, legs squatting... and then wondering why their arms look exactly the same as they did when they started. The bicep is not a powerful muscle. It doesn't need a powerful movement. It needs tension, control and the right mechanics. Twenty five kilos done properly will do more for your arms than forty kilos done like that ever will. If you've been training consistently and still not seeing it, comment GAMEPLAN below. The way you train is a small piece of a much bigger picture.