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Doing so means your heart and lung capacity can improve over time. • Heart rate zones and exercise ability vary from person to person. Use this App as a guide.  • If you exercise on a regular basis and want to improve your cardiovascular fitness, you need this App! • Use this App to determine your target heart rate exercise zone.  This App will help you exercise in your optimum heart rate zone. • A good guideline is to stay within your target zone during the majority of your workout.  This App will calculate your unique heart rate zones and let you view them easily. • When you exercise it is important to be aware of your heart rate.  This will keep your heart rate at a level that will burn body fat and calories and also keeps your heart beating fast enough to gain cardiovascular health.  Your optimum heart rate zones are based on your age and resting heart rate.  If you have any questions about your heart rate zones please consult your doctor.  If your heart rate is too high you may be burning calories, but you may also cause injury to your body.  If your heart rate is too low you won't be get much benefit from your workout.  Also be sure to discuss any new exercise routine with your doctor before you begin.