In our “Why I'm Running” series, Boston Marathon runners share what's inspiring them to make the 26.2-mile trek from Hopkinton to Boston.

The Polar Pacer is a great entry-level sports watch that offers reliable tracking and a variety of features to help you get fitter and healthier, like guided workouts and very detailed sleep tracking.

Use precise geolocation data and actively scan device characteristics for identification. This is done to store and access ...