As readers of Chris McDougall’s article on natural running two weeks ago in the New York Times know, the secret of good, injury-free running form is rooted in the past — going barefoot or doing this simple drill called the 100-Up Exercise that was invented in the late 19th century by a very fast miler by the name of W.G. George whose record for the distance — 4:12 — lasted several decades. Chris provided a short instructional video on the Times website to demo the basics– a minor and major exercise. The simplicity is breathtaking. But does the drill actually work? Will it improve your running form? That’s what Justin Ownings at Birthday Shoes wants to know. So he started a website called Hundred Up and is seeking volunteers.  The site offers more details about the exercise. Clever idea. We hope it pans out.