With a heart rate monitor, you measure and analyze your heart rate during exercise and improve your athletic performance. You can adjust the intensity of your training based on accurate heart rate measurements or train specifically to improve your endurance. A heart rate monitor with chest strap measures your heart rate most accurately. This is because the heart rate monitor is closest to your heart. A heart rate monitor with bracelet is better if you wear sports bras or if a chest strap is chafing too much. Connect your heart rate monitor to your sports watch or smartphone with Bluetooth or ANT+ or read your heart rate data via the computer.