I like the variety in each class. You know the basics of what to expect, but each coach and each class is a little bit different. I also love the feeling I get after the workout. I feel very accomplished!
I've already sent 2 new members your way :)
I like that it's modifiable to wherever the member's fitness level is - It does provide variety that most people don't put into their workouts. And I like Mario. :)
It is a challenge and keeps you working out not just wandering around the gym. The trainers, are wandering around the gym making sure everyone's form is correct and people are getting the most out of the workout.
I like the idea of the heart rate monitors to know where you stand and can't monitor the progression of the workouts.