Like Zen said; I went back.
The friday class has a different instructor. In fact; she was 28 minutes late for a 45 minute long class. That's okay; a fellow class member put in her ipod full of (ugh) Rap music and we all more or less did freestyle until the teacher showed up. So the workout wasn't near as hard.(we'd gotten numerous messages about her progress around a car wreck on I-5) She came in and seemed a lot more sensible than the M-W person. I look forward to having a full class with her next week.
She used a different numbering system than the first woman, instead of having us doing 7,8, and 9 we were doing 2, 3 and 4! who knows.