Circuit training and Hyrox Gyms

So Im interested to join those hyrox gyms / circuit training gyms and i've been checking their IG accounts and based on the stories they post seems most people already there are quite fit and athletic already haha.

Can anyone recommend a good gym for total beginners? I currently don't do any HIIT workouts so im scared that I might not be able to keep up.

Im looking at Squad 5 (westbay), Pulso, and F45 (westbay)

Or if you guys have any other recos based on your experience. Please help a ya girl out.