Quote Originally Posted by aka_kim
Well, not like crazy. I see newbies doing that a lot. Spin to the point where you feel some resistance, and you'll go somewhere, fast. You should not be bouncing in the saddle, and you shouldn't feel like your legs are spinning wildly.
A buddy and I rode behind another couple for about 5 miles yesterday while the somewhat zoftig young lady exhibited this spinning skill. The two of us had a fit of the giggles watching her. She was burning a ton of energy and going nowhere, not to mention she was going to need an entire tube of chamois butter to get back on the bike the next day. Ow!