There are “thousands of so-called square dancing troupes of Chinese seniors that have sprung up in the last few years, descending on public plazas, parks and other urban open spaces across the country daily for nostalgia-infused light cardio workouts. The phenomenon has grown so widespread that it’s causing social friction, with multiple groups battling for pavement space and sonic supremacy in many parks, much to the annoyance of often younger nearby residents.”