For those of you who like to like to run or wish you could, run the way
we evolved to do:
http://www.runningbarefoot.org/
In essence, don't land on your heels; and if you have to wear shoes, use
light thin-soled ones. Also, check out Gordon Pirie's book "Running
Fast and Injury Free", freely available here:
http://www.gordonpirie.com/
Erik