Aerobic Exercise

Aerobic exercise, also known as cardio, is physical exercise of low to high intensity that depends primarily on the aerobic energy-generating process. "Aerobic" is defined as "relating to, involving, or requiring oxygen", and refers to the use of oxygen to meet energy demands during exercise via aerobic metabolism adequately. Aerobic exercise is performed by repeating sequences of light-to-moderate intensity activities for extended periods of time.

According to the World Health Organization, over 31% of adults and 80% of adolescents fail to maintain the recommended levels of physical activity.
Examples of cardiovascular or aerobic exercise are medium- to long-distance running or jogging, swimming, cycling, stair climbing and walking.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY 2.0