Garmin's New Fitness Tracker Has a 'Body Battery' Feature That Tells You When You're Too Tired to Exercise

If you compare all of the ~$100 fitness trackers currently available, you’ll find a lot of similarities when it comes to their hardware, design, and functionality. So to make its new vívosmart 4 stand out, Garmin has instead tried to innovate on the software side by using all of the data the wearable is tracking to…

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