Doing sufficient lower intensity cadio in your target heart rate and eating properly will help you get a six pack. You have to consistently burn more claories then you eat. Things like caffiene and ephedra will help a bit, but its still all about eating less then you burn. If you guys want to get in better shape, I'd suggest going out and buying a book like "The book of Muscle" by Ian King and Lou Schuler. It will give you a good idea of how your muscle fibers work, a bit about nutrition, descriptions and pictures of every exercise, and a year and a half of workouts.