SIZE, SECURITY, LOCATION… that goes for any 24 hr location. Does/can it work? Of course, I like these places, I wrote several business plans for them years ago in college.
Working in the environment I can tell you many stories from requiring police response to oh my god factor. Your retirees have family that visit or many other scenarios can be played out in 24 hrs.
Remember any response to negative operation in this situation is reactive. Are there other amenities besides a workout area that may better warrant 24 hr understaffed operation.
There are two side to every coin except the “trick” coin’s. Be willing and able to deal the opposing (+/-) factor/s of these operations or go in blind and somebody may show you a little trick once or more.