I think picking up people at the bar is easier than making friends at the gym - what you want is to join a crossfit gym, or something that has a stronger community culture to it. Not the gym.
But I hear that with Gen Z and Alpha they dont really go to bars but they do tend to go to the gym, and so the gym is becoming a more social space. So maybe OP is on the right track? https://www.theguardian.com/society/2025/may/15/why-gym-plac...
source: I'm on the younger end of gen z and I can't drink yet