Prolonged, moderate-intensity work that uses up oxygen at or below the level at which a person's cardiorespiratory (heart-lung) system can replenish oxygen in the working muscles. Aerobic literally means with oxygen, and it is the only type of exercise which burns body fat to meet its energy needs. Bodybuilders engage in aerobic workouts to develop additional cardiorespiratory fitness, as well as to burn off excess body fat to achieve peak contest muscularity. Common aerobic activities include running, cycling, swimming, dancing, and walking. Depending on how vigorously a weightlifter plays them, most racquet sports can also be aerobic exercise.
requiring oxygen when describing exercise, it refers to extended sustained levels of exertion during which metabolic processes that provide energy are dominated by the complete oxidation of nutrients