Spin classes are awesome. I spend quite a bit of time on the bike and have found that if I can do the same interval workout on a spin bike. I find good spin bikes to be nice to work on form with, even One legged pedaling. You just have to make sure to control yourself and know that you can free spin. I have trainers and rollers at home, but mixing a spin class in is fun. Exercise is exercise. I don't think anyone will forget how to pedal, just make it a point to keep pedaling. Just my two cents.