Whether it be through school or somewhere else? Music, sports, art, a club of some sort...
I wasn't involved in much as a kid, but I wasn't into sports. I also didn't really know I had options outside of what school offered (maybe I didn't, I'm not sure) but I think it would have been nice to do something I enjoyed as an extra curricular activity. I hope my kids get excited about doing something, but if they don't want to do anything then I'm ok with that too.