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Hands-on: Fitbit's new Flex 2 and Charge 2 Activity Trackers, plus Blaze & Alta updates | DC Rainmaker
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How accurate is the cardio fitness? I've improved from the red line to where it shows now. : r/fitbit
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Is Your Fitbit Cardio Fitness Score a Good Indicator of Overall Health? - The Journier | Cardio workout, Cardio, Health
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