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Cardio is the medical term used to reference the heart. From Greek kardia: heart.

Also used in reference to exercises and/or equipment intended for cardiovascular fitness and endurance training (aerobic exercise). A common usage of the term is "to do cardio", which means to engage in running or other endurance training for a set period of time.

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Cardio". A list of authors is available in Wikipedia.
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