FEATURES: FITNESS Heart rate tracking: The heart of it all—heart rate powers important data like calorie burn, sleep stages, resting heart rate & more. Active Zone Minutes: Tracks your time in heart rate zones so you get credit when you work harder. Workouts in cardio or peak zones earn double minutes. Built-in GPS: See pace & distance on your wrist — no phone needed. Cardio Fitness Score: Estimate your fitness level using your VO2 Max (how well your body uses oxygen during exercise). Daily...