For the longest time, I totally eschewed and even mocked the idea of Spin Classes because I'm a real biker, riding outside where bikers should be riding but lately I've been doing the spin classes that my company's gym offers, and they are great! Riding outside is always going to be the ideal, but I tell you what, 45 minutes of constant cardio and pushing and pedaling is one hell of a workout. I am a sweaty, light-headed mess by the end of it. Plus, we do it on the top floor of our building, which is all glass, so we have a beautiful view of the whole city as the sun goes down.
The real fun comes after the class is over and I then have to bike home.