When it comes to motivating people to exercise, social networking seems like the ideal tool to make it happen. Connecting individuals with like goals and interests and supporting people trying to make lifestyle changes are what social networks are all about. Yet even though most fitness apps talk a big game, there’s little evidence that their ability to create an online exercise community actually translates into more people working out more often. In fact, the science behind the ability of social media to boost exercise among the masses lags significantly behind the marketing of the idea.