Kimberly Spreen presents five workouts based around the fitness ball, each designed to tighten and tone your body. The secret of the ball is that it works on your midsection without you even knowing it. Just by maintaining balance on the ball, you constantly activate your core muscles - so all the workouts will help give you leaner, flatter abs. You can split the five ten-minute sections into five separate workouts, mix and match to hit your own unique problem areas, or do all of them together for a full body workout.