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Tom’s Guide
Tom’s Guide
Technology
Max Slater-Robins

Your fitness tracker has a lot of numbers — these are the ones that are worth watching

Tom Guide
Close-up of the Fitbit Air fitness tracker.

As fitness trackers like the Fitbit Air become better and better, they are now remarkably good at finding new things to measure.

Open the companion app after a workout or a night’s sleep and you'll be greeted by a dizzying array of stats: steps, heart rate, HRV, sleep stages, VO2 max, calories burned, and many more besides.

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