I did spin classes for a while at the Y, but stopped. My knees didn't like it; never figured out it if it was the resistance from the wheel, or maybe the angle at which the pedals forced me to clip in.

It does seem like a neat way to work on aerobics over the winter, but now I've discovered indoor soccer, and I find that a lot more fun (no offense to anyone who likes spinning =))

I did kind of like having spin classes that were somewhat tied to a musical selection, but then half the songs I'd be like "this is a dumb song. I could choose such a better set ..."