Why doesn't body battery decrease with activity?

Hi all I'm new to Garmin instinct solar coming from TicWatch pro 3 and generally loving it.

One thing I can't understand though about the body battery feature is why it doesn't go down during an activity?

For example.today I did a 22.75 km hike in the peak District which wiped me out. But my body battery flat lined for the whole activity.

As soon as I got home and hit the sofa apparently I was stressed (I wasn't) and body battery started dropping rapidly this makes zero sense to me.

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