Aerobic exercise (also known as cardio) is physical exercise of relatively low intensity that depends primarily on the aerobic energy-generating process. Aerobic literally means "living in air", and refers to the use of oxygen to adequately meet energy demands during exercise via aerobic metabolism. Generally, light-to-moderate intensity activities that are sufficiently supported by aerobic metabolism can be performed for extended periods of time.
Read more about Aerobic Exercise: Aerobic Versus Anaerobic Exercise, Aerobic Capacity, Criticisms, Commercial Success
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“When a girl of today leaves school or college and looks about her for material upon which to exercise her trained intelligence, there are a hundred things that force themselves upon her attention as more vital and necessary than mastering the housewife.”
—Cornelia Atwood Pratt, U.S. author, women’s magazine contributor. The Delineator: A Journal of Fashion, Culture and Fine Arts (January 1900)