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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“Sorrow is a kind of rust of the soul, which every new idea contributes in its passage to scour away. It is the putrefaction of stagnant life, and is remedied by exercise and motion.”
—Samuel Johnson (1709–1784)