Men's spas with gyms

When I was at Club Fort Lauderdale last winter, most of the men were nude in the pool and hot tub and on the sundeck, but very few were in the gym. I gather from others that this is the usual situation there.
Is it the same at similar at other male only, primarily gay spas?
If so, does anyone have ideas why?
If you go to any of these and are not nude, what is your reason?

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