I just had a small convo about this in the wing chun thread....a short read on the american wushu site says that it was Sanda, but they changed it officially to Sanshou because it didn't sound as brutal or violent or something like that.
So Sanshou officially.
"I don't know if anyone is known with the art of "sitting on your couch" here, but in my eyes it is also to be a martial art.
It is the art of avoiding dangerous situations. It helps you to avoid a dangerous situation by not actually being there. So lets say there is a dangerous situation going on somewhere other than your couch. You are safely seated on your couch so you have in a nutshell "difused" the situation."