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Cardiovascular Endurance is the efficiency with which you are able to get oxygen to the working muscles while removing metabolic wastes while training. Simply stated, cardiovascular endurance is how well you can keep your "oxygen debt" (how much oxygen you owe to your heart and muscles) down during a cardio workout. Cardio training activities (such as running, cycling, aerobics etc.) are ways to improve your cardiovascular endurance.
 
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