The Flat Belly exercise routine is offered in three levels of difficulty. You follow each level for 3 weeks, then progress to the next level. You will need two pieces of equipment for the routines, but they are very inexpensive. You need a heavy ball, known as a medicine ball, and a large inflatable ball, also known as a balance ball.

Level 1 exercises are simple and should be easy for anyone of any size. You will exercise 5 days per week. Mondays, Wednesdays, and Fridays are known as Belly Days. On these days, your exercise routine focuses on abdominal exercises. Most of these are done while seated in a chair. On Tuesdays, you will do simple upper body exercises, and on Thursdays, you will do simple lower body exercises. Each daily routine lasts 8 minutes.

Level 2 follows the same path as the first level, including Belly Days. This time, however, the exercises are a little tougher, and involve moves done on the floor instead of in a chair. Most of the moves appear to be attainable by larger people, though they may be difficult. Level 3 ab exercises use the balance ball and many of the moves are more difficult. Some appear awkward or impossible if you are very overweight.

If you have a lot of weight to lose, we recommend beginning with Real Shapes, Real Sizes and saving Flat Belly for later. If you are not very overweight and wish to focus on your abs, this may be a good place to start.