I'll second climbing gyms. My entire core group of friends in my city (that weren't already friends prior to my moving here) are people I met from the climbing

I'll second climbing gyms. My entire core group of friends in my city (that weren't already friends prior to my moving here) are people I met from the climbing gym or yoga classes at the climbing gym. Its a great space to meet new people, there are inherent breaks in the activity, shared problems to work on, and its a non-competitive space. Everyone just wants everyone else to send hard.