
Aerobic exercise (also known as cardio) is physical exercise of low to high intensity that depends primarily on the aerobic energy-generating process. Aerobic literally means `relating to, involving, or requiring free oxygen`, and refers to the use of oxygen to adequately meet energy demands during exercise via aerobic metabolism. Generally, lig.....
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http://en.wikipedia.org/wiki/Aerobic_exercise

Prolonged, moderate-intensity work that uses up oxygen at or below the level at which your cardiorespiratory (heart-lung) system can replenish oxy-gen 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 addi...
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Physical activity that increases the heart rate and the body
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http://www.cancer.gov/dictionary?expand=A

Brisk exercise that promotes the circulation of oxygen through the blood. Examples include running, swimming, and cycling. ... (12 Dec 1998) ...
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a type of physical activity that increases the heart rate and promotes increased use of oxygen in order to improve the overall body condition.
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a type of exercise (e.g., running, swimming) that makes the heart and lungs work harder to supply the muscles with oxygen.
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Exercises that cause a temporary increase in respiration and heart rate in order to condition your heart and lungs. Running, walking and swimming are considered aerobic exercises. Aerobic exercises generally burn fat.
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Aerobic exercise: Brisk physical activity that requires the heart and lungs to work harder to meet the body's increased oxygen demand. Aerobic exercise promotes the circulation of oxygen through the blood. Examples of aerobic exercise include running, swimming and cycling.
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Exercise during which the energy needed is supplied by aerobic respiration (oxidation) of energy rich substrates e.g. glucose, using the oxygen that is breathed in (fats can only be broken down aerobically). Such exercise can be continued for long periods.
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physical activity during which the heart and lungs must work harder to meet the body's increased oxygen demand
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Exercise that increases your heart rate and causes you to consume oxygen.
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Exercise that increases your heart rate and causes you to consume oxygen.
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a type of physical exercise that increases the work of the heart and lungs. Examples are running, jogging, swimming, dancing.
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https://www.stanfordchildrens.org/en/topic/default?id=glossary---growth-and

Any rhythmic physical activity that uses large muscle groups and causes the heart and lungs to work harder than when your body is at rest. Also called cardio exercise, it’s been proven to lower blood sugar levels.
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https://www.webmd.com/diabetes/guide/diabetes-glossary-terms
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