It's not what you think. This type of self-massage won't cause blindness or put hair on your palms. If it does, I think you might be doing it wrong.

The video below is from the Yahoo! series, Reluctantly Healthy, and features actress Judy Greer (13 Going on 30, Love and Other Drugs) learning the art of myofascial massage from trainer Tanja Djelevic. The technique involves using a foam roller to "roll-out" tight muscles. While I don't think it looks that difficult, Greer acts like her muscles are about ready to rip from the bone, although that could just be an act.

[Source: Yahoo!]