 Some folks come back to dance after a long hiatus, let's call it, or they want to just continue. Since dance is so much of a time commitment when you're young, it's a shame to throw it all away when you get to college and you focus on something else, so they want to just keep it going and use what they learned. Leo also points out how dancers may be drawn to his class for the physical aspect of it, which can't be found in other classes, or just to hear the relaxing, nostalgic music.