New York City-based Noom launched a new Android app, a pedometer that tracks steps throughout the day while running in the background and only occupying about 3 percent of the phone's battery life.

Keeping track of your physical activity can be hard without a Fitbit, Apple Watch, or other workout tracking device — especially for people who walk as their main form of exercise. The easiest ...

It seems really weird to think back to a time when your mobile phone couldn’t do the jobs of a dozen other devices. Now that smartphones have supplanted everything from compasses and Rolodexes to ...