Well, if you're worried about aerosol, aren't guys exhaling hard when they are pounding the MPAs at the holistic places?
And that little spa room is like a thousand times smaller and more confined than the gym so way less circulation.
At the gym, there's only around 20-30 people in a huge open space and usually there's only a couple of people on the cardio machines that are breathing hard. Most people are using the machines or free weights.
Funny enough, after my session the other day, the MPA started spraying disinfectant into the air...man, can't be good for the MPAs to be breathing that shit day in and day out.