My buddy and I used to walk after lunch if the weather was tolerable, and we could easily look into the "fitness center", and there would be 1-2-3 people in there, maybe, in a center with a capacity for 30 or so (they had about 30 lockers). I've been by just after work and seen the same thing consistently. And the obese people would not bother of course.
We had a nice fitness center in our village that cost me $25 a YEAR, including pool and tennis and etc., so no way was I up for paying more than that per month.
The fitness room in our building here is a bit rudimentary and space limited, but "free".
We were supposed to get some kind of break on our health insurance costs if we wore a "fitbit" kind of thing around, but that never happened. My retiree health insurance keeps going up in price of course, I think I'm at $225 a month now, never use it.
Next year for me is the Big One.