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