Exercise is commonly broken up into two subcategories- aerobic and anaerobic exercise. Technically, these terms refer to the presence (aerobic) or absence (anaerobic) of oxygen in cell metabolism, the process by which the cells of the body obtain energy.
In aerobic work, the body uses oxygen to produce energy. Often, this means that the heart and lungs are working harder than usual, in order to get enough oxygen into the muscles. In aerobic activity, the muscles utilize oxygen to...



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