I don't even know why they call it spinning at my gym...it should be called mashing. That's all they do: rachet the tension up enough to stand, and stand and mash at low revs for song after song after song,constantly increasing the tension until they're 'spinning' about 20 rpm...

Yeah, it made my knees hurt. It made everything hurt. I expect it's good as a once-in-while thing, but I'd never do it as my regular bike ride.

I'll go back to this gym's 'spinning' classes when I'm ready to train for L'Alpe d'Huez.

DAgna