Fitbit Support on Twitter: "@chillin4ever086 Hi there! Your tracker measures your heart rate even when you're still or calm which refers to your resting heart rate. To know more about the heart
Charge 4 heart rate zones inaccurate - Page 2 - Fitbit Community
Solved: Heart rate zones - Fitbit Community
Solved: Staying in peak heart rate zone whilst running - Page 2 - Fitbit Community
Fitbit App Heart Rate Zones - Fitbit App Ionic, HD Png Download , Transparent Png Image - PNGitem