Cardio sucks, man. It raises estrogen levels. Aerobics instructors have some of the highest bodyfat percentages in the fitness industry. It's because of low-intensity, long-period cardio. Burn your fat through good diet (CKD if you've been having trouble getting abs in the past), weights, and interval sprints. Also, ECA, morning Yohimbe, topical Yohimbe and topical diuretics can be invaluable in getting rid of those last necessary pounds of belly fat.