In Jan., 10 days on the bike and 12 at spin class. I figure that I've done a total of about 500 effective miles this month.

I enjoy spin class, to a degree. They're really great for concentrating an hour of effort. Our gym has Keiser spin bikes that give a power calculation, plus HR, cals, cadence & time.

It's nice to be able to do both during the winter. Yesterday I did a spin class and was starting to feel a little sluggish. I thought that I may need a break from riding. When I rode outside today, I felt terrific. The change of scenery really did me good.

I hate trainers.