No, Cathe isn't teaching that class. Double step is fairly the same as single stepping except the step board is longer (left to right). At my gym, the steps are placed side by side, and at the end of the class you partner up and do the routine together....listening skills come into play here. The other person is facing you but on the opposite side of the other step. At Four Seasons it could be a different set-up.
I'm worried about the advanced step class, too. New class, different gym is always scary.
Namita