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With "CALORIES CHALLENGE" you will be your own coach to eliminate your little food excess and accelerate your weightless!Choose a "CHALLENGE", RUN and see it melt!Nothing like the motivation of looking calories disappear during your session! At the end of the session, you can share your challenge with your friends on FaceBook or Tweeter, and keep a track on the iPhone calendar and on the "Log Book" integrated at the application.For simplicity:- The Apple Watch application allows you to know where you are of your calorie killing in a glance!- The links with HealthKit application of the iPhone makes it easy to merge your health data!"Continued use of GPS running in the background can dramatically decrease battery life."