Knowing your heart rate is important because if you are working out too hard, your activity can become counter productive and strain muscles. To achieve an effective workout, no matter what the aerobic activity, you must maintain your heart rate at a proper level for a minimum of 20 minutes. The proper level is generally 65%-85% of your maximum heart rate. Weight Management products help you monitor progress in achieving a healthier, more active lifestyle. Whether your goal is to maintain or improve overall health, lose weight or get more energy in your daily life, physical activity is essential to staying healthy.