Start moving with a fitness tracker
Image: ThinkstockYou've probably seen people wearing digital fitness trackers, small gadgets that come in wearable styles such as wristbands and pendants or handheld versions you can slip into a pocke
Image: Thinkstock
You've probably seen people wearing digital fitness trackers, small gadgets that come in wearable styles such as wristbands and pendants or handheld versions you can slip into a pocket. Why are they popular? The devices record your workout data, and they track your progress on those measures.