A fitness ball may be an excellent tool for toning your abdominal muscles (abs) and other core muscles. Choose a fitness ball that allows you to sit on it with your feet flat on the floor and your knees to be at the proper angle. It should also be possible to stand up straight when sitting on the ball. Exercising with a fitness ball will help strengthen your core, which is important if you want to keep yourself upright while standing or sitting for long periods. Ball exercises are useful for targeting specific areas of your abdomen, such as your rectus abdominis muscle or your transverse abdominis muscle. For example, you can work out your rectus abdominis by rolling the ball forward and back while keeping your arms straight. You can also do planks on a stability ball, which is great for developing your core body strength. Stabilizing your body in a full range of motion during abdominal exercises is important for getting the most out of them. A fitness ball helps by allowing you to perform moves that might not be possible on another type of apparatus. For example, if your chair doesn't have a seat bottom, then you can't do sit-ups from a chair. But you can use a fitness ball for this purpose. You can also use a fitness ball as part of a total body workout.