That would have to be ChiRunning.
http://www.chirunning.com/shop/home.php
* Run injury-free for the rest of your life * Increase efficiency with a mid-foot strike * Increase your speed while reducing effort * Finish a pain-free marathon and look forward to running again! For beginners and competitors and practiced by thousands of runners, ChiRunning combines modern physics with the ancient wisdom of T'ai Chi to create a running form that is easily learned and makes running more effortless and enjoyable.
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