1. The heart.
2. The cardia (ostium cardiacum).
Origin: G. Kardia, heart
(05 Mar 2000)
Card
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.
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