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Aerobic exercise is physical exercise of moderately low intensity and long duration, which depends primarily on the aerobic energy system. Aerobic means "with oxygen", and refers to the use of oxygen in the body's metabolic or energy-generating process. Many types of exercise are aerobic, and by definition are performed at moderate levels of intensity for extended periods of time.

Aerobic exercise, also known as cardio or endurance activity, is the base of most fitness training programs. Aerobic exercise causes you to breathe faster and more deeply, which maximizes the amount of oxygen in your blood. The better your aerobic fitness, the more efficiently your heart, lungs and blood vessels transport oxygen throughout your body, and the easier it is to complete routine physical tasks and rise to unexpected challenges, such as running to your car in the pouring rain.

Aerobic exercise includes any physical activity that uses large muscle groups and increases your heart rate. Try walking, jogging, biking, swimming, dancing, water aerobics, even leaf raking, snow shoveling and vacuuming. Aim for at least two hours and 30 minutes a week of moderate aerobic activity or one hour and 15 minutes a week of vigorous aerobic activity, preferably spread throughout the week.