Aerobic Fitness or Cardiorespiratory Endurance - the ability to deliver oxygen and nutrients to tissues, and to remove wastes, over sustained periods of time.
Any activity you do from taking a walk to washing the dishes it requires oxygen.
Regular aerobic fitness exercise increases your body's ability to use oxygen. How well you use oxygen is termed your "aerobic capacity." When your aerobic capacity is high, your heart, lungs and blood vessels efficiently transport and deliver large amounts of oxygen throughout your body. Aerobic exercise helps you in your daily activities.
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