GPS smartwatches and fitness trackers work so seamlessly that it’s easy to take for granted the intricate cosmic efforts required to make it happen.
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Albeit a few kinks, the new body mass index tool lets you get your range at the click of a button.
If you can't get enough of tracking your own data, you'll love seeing Sara Hall's activity from the Chicago Marathon.
You can learn a lot from activity tracking—even if you just track your steps.