The 100% cotton Batman Works Out T-Shirt has really been hitting the gym. Getting in the protein shakes, doing P90X and Insanity, quilting, and learning to playing the harp. Those last two really get the muscle definition in there. There is always that great argument on whether Batman or Superman wins in a fight...I think the Batman Works Out T-Shirt implies that it actually might be a bare knuckles brawl!