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The new Fitbit Charge 3 features 24/7 heart rate so you can track calorie burn more accurately, optimize your workouts and un… | Fitbit, Fitbit charge, Fun workouts
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Fitness trackers aren't very accurate at measuring heart rate — and that can be dangerous - The Verge
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Fitbit Charge 3 with heart rate monitor review
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AHA: Fitbit shows it can track down atrial fibrillation in 450,000-strong heart study | Fierce Biotech
Amazon.com: Fitbit Charge 3 SE Fitness Activity Tracker Graphite/White Silicone, One Size (S and L Bands Included),1 Count (Pack of 1) : Sports & Outdoors