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Exercise is essential in achieving a healthy lifestyle. Cardiovascular is a great way to use the body’s large muscles in order to increase your heart rate and burn fat and sugar. Monitoring your heart rate during exercise simply shows the intensity of exercising. There are many different type of aerobic exercises, and different ways to achieve a desirable fitness level. Intensity is an important factor in a great fitness program. Intensity is how strenuous the activity is. Generally to establish the intensity of the exercise, a combination of a person’s VO2 max and rate need to be established. VO2 max is the maximum capability for the body to transport oxygen from the air, through the lungs and blood, to the various muscles. It involves the heart’s ability to pump blood to the muscles. The first step in finding the intensity someone should workout at is finding their maximum heart rate. This can be calculated by the simple equation 220-AGE, someone that is 15 would have a maximum heart rate of 205, for an example. Now for someone in poor condition