The first version of the Apple Watch, launched a decade ago, revolutionized the wearables market for fitness enthusiasts. Using a built-in heart-rate sensor, accelerometer and gyroscope, the wrist-worn device allowed users to monitor their fitness stats in real time. But that wasn’t the biggest bonus of the Apple Watch. It was one of the first activity trackers worn all day, allowing an unprecedented collection of data on movement patterns, calories burned and physical activity over days, weeks and months. So instead of capturing individual workouts stats like previous activity trackers, the Apple Watch’s always-on feature gave one of the first objective looks at how active you are outside of deliberate exercise.

Other smartwatches like Fitbit , Garmin , Google and Polar have followed, ea

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