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Exercise balls are very popular for abdominal exercises. To start with the simplest, lie on your back and put your feet on the exercise ball, then do crunches. A great exercise is to lie with your back on the floor and your feet on the ball, and then do crunches. This gives a little extra range of motion. For something more challenging, get in pushup position with your knees on the ball and contract your abs so your knees come in and your hips go into a jack knife position. These are just a few exercises you can do with an exercise ball.