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The title of the thread is also the title of a book by Jack Cady whose www.stridemechanics.com website promotes 5 principles of efficient running as derived from watching how elite distance athletes run.
I see that there is a POSEtech thread on here and a ChiRunning thread on fetch and know also that evolution running and the Alexander Technique are supported by others. The purpose of this thread is to focus on the principles and guidance given in "Efficient Running" by Jack Cady. So, if you are interested join me here and let's help each other run longer, faster and without injury.