Don't know about the bikes, but my old gym tried these classes and they were run out of town by people like me. I dislike "programmed" or scripted routines that are the same for 2 weeks and then you get another one. They also tried the step and Body Pump stuff and the Body Pump stuck, but I hated that, too. I am sure it is perfectly programmed for endurance, but I just didn't like it.