Oh ya.. Gym goers are notoriously right wing.. It is annoying.
Even in Europe (where I am from), most gym goers are people who would have voted for Trump. I think it might be due to the fact they are generally younger? I don't know. I do know that it is annoying trying to befriend someone and then you find out they are right wing. God damn.
I don't think gym goers usually listen to podcasts in the gym. They probably do it outside the gym. But again, they could just as well listen to someone like Peter Attia or Mike Israetel. It doesn't really answer the question: Why is it that gym goers are generally right wing? Maybe they are not and I am just suffering from a selection bias.