Another cool one: r/explainlikeimfive
And isnt it a circlejerk site where they upboat each other and a different opinion isnt allowed?
Yeah, kinda. I'm sometimes afraid to give negative commentary to training videos or calisthenics books that are absolutely shit because there always are butthurt fanboys to downvote your shit. The veteran users might know better, but it's the newmy old friends who think they know everything that downvote everything they don't agree with. Only making a joke or making a really well explaimed post so the people who know better upvote you as well.
Basically you make an account and when you find a subreddit that is relevant to your interests you
subscribe to it and it will appear on your front page when there are posts you should check out there.