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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 cardiovascular endurance training for a set period of time, for example running, swimming, jogging, cycling, etc.

[edit] External links

• http://exercise.about.com/cs/cardioworkouts/a/cardio101.htm
• http://getdenas.com/device/diadens-cardio.html