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/cdn.vox-cdn.com/uploads/chorus_asset/file/19980316/Fitbit.jpg "The FitBit Alta HR helped me monitor my heart rate. I never want to see it again. - Vox")
The FitBit Alta HR helped me monitor my heart rate. I never want to see it again. - Vox
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Fitbit heart rate monitor in-depth: Accuracy, features and zones explained
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Fitbit heart rate monitor in-depth: Accuracy, features and zones explained
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