The best fitness trackers have a very simple purpose of keeping you pacing towards your health goals. Depending on the person, those objectives can range from improving your sleep regimen, getting your daily steps in, or hitting peak Schwarzenegger-level physique. The latest class of fitness trackers have advanced way beyond your grandma's OG Walk-A-Matic. Sure, these wearables will count your steps, but now they'll also give you a pretty good estimate of how many calories you burned, the amount of flights you've scaled, and even your walking asymmetry (a pretty neat stat that tells you how your legs differ during your walks). All of this data comes together inside these fairly tiny devices to let you know just how well you're doing health-wise. They'll even help you make better, sma

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