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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.
Smartphones with Fitness Apps. Best for tracking speed, distance, elevation gain. There are numerous free apps available to download onto your smartphone that work with your phone's GPS to allow you to track your speed, distance, elevation gain and more while you run, bike or hike.