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Your heart is a muscle that is located on the left side of your chest and is about the size of your fist. It sends blood thoughout your body, providing it with the proper nutrients and oxygen that it needs. The heart is also made up of four different blood filled areas which are called chambers. Each side of the heart contains two of these chambers that are used primarily to send blood to your lungs. This is why the need of cardiovascular exercise is important because the more blood being transfered from your lungs to your heart, the more calories you are burning.