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Charge 3: Any update on the bug that doesn't show heart rate zones when you manually track exercise? I use phone GPS to track walks to get distance and map, but it
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Amazon.com: Fitbit Charge 3 Fitness Activity Tracker, Rose Gold/Blue Grey, One Size (S and L Bands Included) : Sports & Outdoors
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Burn Fat Fast With Target Heart Rate Zones
Charge 4 heart rate zones inaccurate - Fitbit Community