Charge 3: Any update on the bug that doesn't show heart rate zones when you manually track exercise? I use phone GPS to track walks to get distance and map, but it
Fitbit Charge 3 & 4: Heart Rate (BPM) Not Working (How to Turn It On) - YouTube
How do I get started with Fitbit Charge 3?
How to Restart Fitbit Charge 3 : Easy Steps, Tips & Tricks