Jog ’n’ log
Sync that activity tracker on your wrist to automatically upload your running data to a social network of exercisers, and you could run stronger and go longer as a result, suggests a new study in the journal Nature Communications. Researchers examined running frequency, time, and distance for a group of runners in the same friend network—but not the same cities—over five years. They found that even on poor weather days, the geographically diverse group displayed similar training routines. This shows that running can be socially contagious, the study authors say— when you see others posting miles, it spurs you to run a little farther and improve your pace. Try it yourself with an app like Strava (free for iOS and Android).