Climbing (not bouldering), you literally trust with your life to other person. Or some hiking/alpinism sports club, usually if they do 1 of those many of them do other interesting stuff like ski touring in winter.

Motorsports, especially motorcycle racing is great because you’re completely in to yourself on track, then off track, you are inevitably going to help someone load a van, or get a bike on a stand or put on tire warmers, etc. It’s unforced because there’s a task to accomplish together, but then friendship develops seemingly effortlessly.

JiuJitsu has been a great place to make friends. On open mat days you spar with someone for ~5 minutes then chat a bit, then find someone else and repeat. Small group chats at the end, maybe grab some food.

The are a lot of IT oriented people at my gym, but also surgeons, lawyers, business owners, etc...

The key, like anything, is try a few different schools to find the vibe you want.

> team sports are generally not fun for introverts

Uh, citation needed?

Team sports may not be generally fun for people who are shy or who have poor social skills, but those 2 things aren’t synonymous with introversion.

But team sports can be great fun for people who are shy or who have poor social skills because they force improvement of those skills.

I signed up for team sports precisely because I have a lot of social anxiety, a tendency to be a loner, and a fear of being publicly not very good at something out of the gate.

Experiences may vary of course but I've been doing it for a couple of years now and have found it tremendously helpful.

hmmmm I consider myself an introvert and I liked it. Maybe I'm not as introverted as I thought...