When I work out, I can hit low reps and crush out heavy weight. I love it. Makes me feel strong etc. But then when I hit a lower weight say 12 reps and really focus on the pump it feels like my muscles are tearing out of my skin. Now I love both feelings. I also know what Arnold would say about this. http://www.youtube.com/watch?v=MDIJQmL4Lzs But which is more conducive for muscle building? Sure I want strength. But I would prefer at this point in my life to look better.