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Heart rate recovery refers to the period of time after a workout when your heart rate returns to its average resting rate. During exercise, your heart tends to beat much faster, and when you’re finished, it can take a minute or two for it to lower and return to a normal rate. A faster return to your normal heart rate is one indicator of physical fitness, and a decrease in recovery time over a period of time can indicate an improvement in physical fitness. Because the Apple Watch has a built-in heart rate sensor, it can track this statistic during your workouts and display the information in an easy-to-understand graph. You can access this data through the Heart Rate on your Watch or the Fitness app on your iPhone.