Aerobic exercise refers to physical activity that expends considerable energy, increases blood flow and respiration, and thereby stimulates and strengthens the heart and lungs and increases the body’s efficient use of oxygen. It is an activity in which the body is able to supply adequate oxygen to the working muscles, for a period of time. Running, Cross-country skiing and cycling are examples of aerobic activities.
Other /More definition:
Aerobic exercise refers to high-intensity, long-duration, and high-endurance exercise, believed to contribute to cardiovascular fitness and other positive health outcomes; exercise that requires an increased amount of oxygen consumption over an extended period of time.

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