I very much hope not. I've been in four gyms since they reopened (I'm in England) and they are incredibly well organised and very strict, with tight controls around cleaning/hygiene and track & trace, one way systems, use of equipment etc. I taught a class the other week in a leisure centre and realised I'd forgotten something when I got back to my car, so went back in straight away and they were already mopping the floor with disinfectant and sanitising everything. I feel far safer there than I do in the supermarket which is a bit of a free for all now and people picking stuff up, putting it down again, leaning over you to reach into the freezer, no one way system other than designated doors for entry and exit.
I moonlight as a fitness instructor and am about to launch a new community class in a local hall, and the risk assessments, paperwork, cleaning routines, maths around safe spacing and so on that we have to do are quite onerous but very closely adhered to, and our governing body has been great with providing support and guidance.
So many people I know are self employed fitness instructors and are really struggling at the moment as gyms haven't reopened with a full timetable due to restrictions, lots of people have lost half their regular classes, and many haven't been able to restart their community classes as restricted numbers make it financially not viable as they'd operate at a loss. I also know a local leisure centre that is really struggling and won't survive a second period of closure which means potential job losses but also the loss of an important community resource that's used for children's swimming lessons, clubs for elderly people, birthday parties, holiday clubs etc.
Hope you're ok OP, it's a hard time to be in the industry 