When my kids were little they could do anything they wanted as long as it was offered at school because they were in afterschool care. They went to girl scouts, choir, spelling bee, volleyball, basketball (sometimes those practices were later, at another church, coached by dads who also worked full time).
I really don’t know any kids who only do one sport. Even my one sport kid did other things with her friends like swimming, running, working out. She probably would have done more sports but two of her high schools charged a lot for sports so one didn’t just do them for fun.