6. Fitocracy - Launched for iPhone in 2010 by two former out-of-shape video-game addicts, Fitocracy has become a hot ticket, with more than 1 million registered "Fitocrats" playing against each other to enhance their fitness and swap workouts, advice, and inspiration. In the game, users begin at level one, then depending on the frequency, duration, and difficulty of their workouts, they earn points and bump up to the next level. Free. Availability: iPhone and Android.
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Source : http://www.nydailynews.com/life-style/health/top-6-smartphone-apps-losing-weight-article-1.1310526