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Even if you are not doing specific exercises, simply sitting on an exercise ball engages the muscles of the abdomen and back, also known as active sitting, which builds strength and promotes good posture. Some people use a ball as a chair either at home or in an office, and specific exercise ball chairs with swivel bases exist for this purpose. But if you have a back injury or other health problems, consult your doctor before buying an exercise ball chair; an ergonomic desk chair may be more appropriate.