or How 'bout rollers?

[7rider]

I see several on Craigslist. Are they difficult to use? or to learn to use?

Rollers are a wonderful tool to teach you how to pedal circles and ride a steady, straight line with minimal body movement. It teaches you efficiency on the bike and is less "forgiving" of bad habits.

There is a good thread on learning to ride rollers here: http://forums.teamestrogen.com/showthread.php?t=20494

I ride rollers. I don't find them difficult, but they did take a bit of practice to learn. Your riding style improves for the effort, however.