They have something similar at my gym called Quad step. I never took the class because the time was not right for me, but one of the instructors was telling me that if you're just starting quad step, you have to be in the beginners spot so everyone is running into everyone else, but as you get better you're allowed to move up through the steps and get with people who are better. I was always nervous to try it anyway because it sounds even worse with a bunch of beginners all grouped together - kind of like a beginners karate class where no one really knows how to aim a kick...
