Fitballs are sized by the height of the user and can be purchased at any sporting goods store. Packages are labeled with the appropriate heights. As a general rule, you should be able to sit on your Fitball with your feet flat on the floor with knees bent at a 90-degree angle.

Target Exercises for Every Body Part

Literally every target exercise can be performed on a Fitball. Make sure to warm up completely with a good stretching routine and light cardio to make your muscles more responsive to exercise. If you're feeling a little unstable on the ball, position it near a wall to keep it from rolling.

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The following exercises target the basic trouble spots. These exercises represent just a small number of the exercises that you can perform on a Fitball.

Abs Crunches

Establish your balance as you sit on the ball with feet firmly planted. Place your hands on the ball and walk your feet forward until you reach a reclined crunch position. Your weight should rest on the ball from lower back to shoulder blades. Place your hands behind your head in a traditional sit-up position with fingers laced. Exhale as you curl yourself up using your abdominal muscles. Inhale as you return to your starting position.