>>33556234 (OP)
Haven't done any of these activities consistently personally, but I'll say one thing before I say my suggestions: I'd say a good chance of getting a gf from these activities is about 1 year of attending consistently, which is much slower than other activities like dancing, singing and acting.
Now that we got that out of the way, my personal suggestions would be:
Running club/reoccurring activity
Tennis
Kayaking/rowing club (it's also really fun)
And very rarely in some martial arts, girls also attend.
Keep in mind though, that everyone attending the activity is doing the activity, and just because it's active and gets testosterone and serotonin flowing it doesn't mean that women who come there just pick the male they are going to fuck that day. Humans are much more complex than that, and you're still going to have to shine as a good personality and expressive person to actually get the girl.
To do that you'll have to make friends with girls in that group, outside of the activity. The reason I said 1 year of consistent attendance in these activities (which is pretty damn long) gives you a good chance, is because you have to be a staple in the group. Where everyone sees each other as friends and a community.
That takes a long time
Honestly at this point I've just convinced myself that dancing is the best way to get a girl, alongside singing and acting, because you get to express yourself, you. Dancing is unique to you and your partner in that moment, it's your body language, it's how you communicate, it's you. Singing is your voice, it's how you communicate, it's you. Acting is how you speak and move and emote, it's how you communicate, it's you.
Running/kayaking/bouldering/gym/martial arts is more just doing the same repetitive thing (with the exception of martial arts past a certain point)
So yeah as a person who sat and thought about this for a long time and now I'm actually acting on it I dance and I sing , this is my best guess