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My Forerunner 45 says HR zones are "0.5" and "0.6." Any idea what these actually mean? (Screen shows HR Zone, HR, and Calories) : r/Garmin
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Road Trail Run: Comparison Review-2016 Garmin GPS Watches with Wrist Heart Rate:Forerunner 735XT, Vivoactive HR, Fenix 3 HR
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