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Download HRM Pro data

Hi everyone, I have a Fenix 6Sapphire and I have recenlty bought an HRM Pro band.

My question is: When i finish an activity, (that can be either run or bike), in the activity's menu there's a voice called "Donwload band data" (translating from italian), but everytime i donwload it some data like the aerobic/anaerobic data completely change. So, do I have to always donwload that data through activity's menu or not? Like what doest it change?

Thx everyone who will help and sorry for bad english <3