ANSWERS: 4
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Cardio is the excercise done to increase your heart rate. So running, eliptical trainers and so on.
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Cardio is a word relating to the heart, and blood vessel system. Any word with this prefix means it relates to the heart somehow. Eg Cardiac arrest - cessation or stoppage in heart function. Cardiovascular - relating to heart and vessels. Cardio work out - makes your heart beat faster.
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Cardio is to do with the heart http://exercise.about.com/cs/cardioworkouts/a/cardio101.htm http://exercise.about.com/od/cardioworkouts/Cardio_Workouts.htm
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Cardio is the medical term used to reference the heart.
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