What is in your opinion the one sport or activities that has the most potential in making new friends?

Hi, i’m 24M and i started only now to realize the true power and value of being part of a group. I’ve always been alone due to my strong sense of duty to my graduate studies but now i realize that i lack a true social life ( i have few friends from hs but they have their own social life and we have lesser time to hanging out). I also want to get back on track whit my fitness capabilities and doing some sort of activity. In few words i want to have a solid social life that balance my career.I wonder what is a sport that make easier make friends and possibly create a sense of community(i heard for example that crossfits has this features). I’ll be curious to read your experiences. Sorry for the grammar but i’m not a native speaker.