Never heard the term "quadrobics" until now, but the phenomenon you describe is well-known in the west. People (this regrettably includes adults, I can confirm) who engage in it are called "furries," and they have been the butt of many a joke for years now, my favourite being this one:

Were it just kids being kids, it would be nothing to worry about, but it's much more than that. Furries are an entire subculture which I know a disturbing amount about, despite never having personally met any. I may have an unhealthy fascination with people who are stark raving mad.