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Yeh, I don't really understand how this is measured, and this is pretty unhelpful
https://www8.garmin.com/manuals/webhelp/edge520/EN-US/GUID-E7F8B9B6-ED95-49A6-998F-B21DB8DA4734.htmlMy best (after two workouts) was 71, but the above page does say you need a few workouts for it to start being reliable
That's interesting. Suggests it is looking back at past data etc. Like a PMC i suppose - takes time to build up the past info