Here's another simple stretch that we often do improperly. This is Dr. Bob Donatelli from golfersmd.com, and the stretch is for your hamstrings. Why do I like this video so much? Because he explains not only how to do the stretch, but why we want to do it this way. It's basic Schoolhouse Rock -- "Knowledge is power!"
Seriously, hamstrings cause a lot of back (and swing) problems, so learning to stretch them properly is important. Best of all, you don't have to stand on your head!
I've added a new link list called "Some Useful Golf Links" just above my blog lists, and GolfersMD is the charter member. You might want to check out the site, as it looks pretty good.