Before the vaccine or after? Do they have data linking overwhelming spread to gyms? What about restaurants & malls?
At some point we are going to have to accept there is risk. Covid-Zero isn't possible & we shouldn't be operating as if thats the goal. If the goal is 'endemic' then risk is inevitable.
Closing down gyms & repeatedly locking people down (actively making the pop. less healthy) isn't a good long term strategy either. People don't want to live like this forever.