A fifteen minute yoga routine every other evening. I went from waking up stiff and in pain every morning to feeling like I did in my late twenties/early thirties.

I can e-mail you a Quicktime movie of the routine (cute blond yoga teacher) if you want. You won't notice much change for the first few weeks but by 4-5 weeks you'll be amazed. The routine is designed for newbies.
-Blast