Got no idea where that's from. Was wondering about it too.
Never seen anything else than good, even in a brick without the brick mode but 2 separate sessions.

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-shoki

https://support.garmin.com/...f27b-000000000000%7D

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Trust me I’m a doctor!
Well, I have a PhD :-)

Pretty crappy of Garmin to include features likes this without explaining how to use them and what variables go into the algorithm. Garmin is in a silly race with themselves to continue adding features and metrics just for marketing sake and trigger upgradeitis.

This isn't helpful. The OP is asking what it is actually doing. Something I am curious about as well, along with how it calculates VO2Max