yeah gym bikes can be pretty crummy
my last gym had pretty good ones
my current gym has a spin class room but haven't seen any spin classes & I believe I can use one of those cool bikes w/ my own cleated shoes whenever I want but I haven't investigated
my last gym had many stationary bikes, including many recumbent bikes, which I prefer at the gym
my current gym has a single stationary recumbent bike, which I only used once

when it's rainy & I don't want to ride outside I sometimes go to the gym & use the treadmill & watch a movie on on my phone