Yeah, I think individual gyms are handling it differently, so it's definitely something worth asking about when considering one.
When my gym first reopened last year they were super strict.
- Workout areas were designated with squares on the floor and socially distanced.
- When outside of a workout area, you had to be masked.
- Classes were capacity limited by social distancing.
- Even though the gym is "unlimited access" for individual work, you still had to schedule an appointment so they could limit and monitor capacity.
- And only so many people were allowed in the locker rooms at a time, I think like 5 based on the size of the locker room.
The locker room thing was the biggest inconvenience. Most people ended up changing and showering elsewhere.
They have since dropped all of those limits. If you're unvaccinated you're still supposed to be masked, but it's self-enforced. All the other restrictions have since been dropped.
I will add that studies of contact tracing and transmission tracking has shown a very low incidence of COVID transmission at gyms. The speculation is that it's because gyms usually have a pretty high rate of air changes. They need to move a lot of air so they don't get too funky. So that's a decent check. If you visit the gym and the air doesn't smell fresh, then you might have a higher risk there.