What is the dojo for in Club Penguin?

The dojo is a strange hidden place on Club Penguin it has recently been hit by a storm and penguins call it the ninjas hideout and theres a sugn up wich says ninja training nov17th i think taht might mean ninja training ---- Well, before the storm hit the dojo.... It was just a quiet, ninja, hidden place. That had nothing in there. And many wars also occured there. Hope this helps :-)