While it might seem obvious, I know people who just dance on spot in public when they hear a song. They might not even hear a song, they might sing it instead. I also know people who like to dance in their room (as someone else here mentioned). They might not use the very complex moves though, I dont know if you ask specifically for these.

People probably use more “serious” moves in dance classes/events/clubs.

PS. I’m too shy to dance and I ~always admire people who do (especially when you see that they don’t do it forcefully, they just express themselves). I’m doing some dance classes to improve my situation, hopefully I might make it, or at least I’ll have tried🤷