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Garmin connect heart rate zones went crazy after I accepted new running threshold after a 10 mile long run. Fenix 7x via garmin's HRM. : r/Garmin
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Amazon.com: PlayBetter Garmin Forerunner 55 (Black) GPS Running Watch | Beginner Friendly Heart Rate Monitor Watch with Time, Pace & Speed Tracker | Power Bundle Tempered Glass Protectors & Portable Charger : Electronics
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