Pronunciation: (â-rō'biks),[key] —n. 1. Also called aero'bic ex'ercises.(used with a pl. v.) any of various sustained exercises, as jogging, rowing, swimming, or cycling, that stimulate and strengthen the heart and lungs, thereby improving the body's utilization of oxygen.
2. (used with a sing. v.) a physical fitness program based on such exercises: Aerobics is a good way to get your body in shape.