There was a really useful post by HermanB from Firstbeat across on the Fenix 6 forum, that may directly be of interest to MARQ owners too. I'm going to shamelessly copy HermanB's post (https://forums.garmin.com/outdoor-recreation/outdoor-recreation/f/fenix-6-series/211574/load-focus-training-load-balance-video) here, as can't find a way to quote a post across sub-forums and threads.
HermanB:
"Hi everybody,
Thought I'd share this short video we put up today about the Load Focus data screen on the F6 and FR945 and MARQ collection watches.
Happy to hear any feedback from your end or answer any questions. https://youtu.be/He462cAn0Uo
P.S. That's my voice on the recording, so be kind. ;-)"