Recently I started going back to the gym, and trust me after the holidays, I really need to get back in there. I have started a new fun routine by taking a lot of the sampler aerobics classes. While I do feel like I am getting a good workout, I still feel like my stomach needs additional attention. I am looking for the best ab workout that I can do while I am still in these aerobic classes. While the rest of the class is doing what I consider a light tummy exercise, I would like to be really working hard.