If you own a Fitbit Charge or Charge HR, you already know what an amazing job your wristband does of tracking your activity, sleep, and heart rate (if you have the HR model). But you also know that ...

There’s one New Year’s resolution that lingers year after year: getting in shape. That could be one reason Fitbit’s app skyrocketed to the top of Apple’s App Store on Christmas Day. Although Fitbit’s ...