Just like that. I manually enter it every day and sometimes it changes an old HR (for example today the 28 february changed to 120 from 48 bpm randomly).
You have “Download Garmin Wellness” ticked in the Garmin box in /settings and sometimes Garmin is sending (bogus looking) resting HR data. You can click the list of wellness items in the Garmin box and untick resting HR.
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