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I totally agree with this. I enrolled in martial arts one year after moving to a new city, and they've become a great circle of friends. The camaraderie you build with martial arts folks is a special one.

Similarly, a sports team or another group engaged in relatively challenging physical activities (such as hiking and backpacking, especially in CO this would be a lot of fun).

I actually have a buddy who's into Tai Chi and also recommended this to me as a way to meet new people when i first came out here. This completely escaped me since. Thanks for the suggestion!