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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.
Article Text. Your Fitbit tracker recognizes and awards active minutes when the activity you're doing is more strenuous than regular walking, which includes everything from a brisk walk to a cardio workout or run. All Fitbit trackers calculate active minutes using metabolic equivalents (METs).