This assumes the gym is in your basement.
Discussion
The gym is whatever floor you're standing on, in a pinch.
Otherwise, a few dumbbells are usually pretty cheap on craigslist.
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A set of dumbbells that can drop weights + one or two kettlebells; I have a gym in my office.
I did that for years (also in my office) but finally caved and bought a high-quality pair of adjustable dumbells; feels like a total luxury. Those + a bench + gymnastic rings on the ceiling is a pretty solid setup for not too much money or space.
You said it better - adjustable dumbbells. 💯 ⚔️