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The research is mixed as to the effectiveness of various wearable fitness trackers on the market so farâ a 2013 study found that trackers mounted on shoes monitored movement far more efficiently than those at hip-level.
Price: Free. What does this app do?: Runkeeper uses your phone's GPS to track your workouts and provide you with relevant data, such as your average pace and time, in order to help you gauge your progress and achieve your fitness goals.