Cardio is short for 'cardiovascular', a term used to describe the human circulatory system; it consists of the heart and blood vessels. Cardio training is a form of endurance-based exercise designed to strengthen the circulatory system. Cardio-vascular exercise usually takes place over a longer period of time, and is intended to make the heart beat faster and pump more blood through your system, which carries the vital nutrients and oxygen to muscle cells. Cardio exercises usually get your heart rate to around 50 - 75% of your maximum heart rate. A rough estimate to calculate your maximum is 220 minus your age, so, for example, if I'm 18, it's 220 - 18 = 202 Max. Cardio can be almost any form of exercise from running, cycling and dancing to treadmills, rowing machines and more! 

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