http://www.suubinc.com/does-zi....g-zag-scissors-stop-
What are a few their annoying? Well for one, NOT bending the knees enough; which results in a lot of impact on the ankles and knees. And two, developing the practice of landing with the heel, rather than the forefoot. This, basically stops the runner's forward momentum, and 'puts the brakes on.' Also, it sends a 'shock' through the entire leg, starting with the heal, and sending it up through the knee. Not good, and also major belief that runner's in padded, expensive shoes, claims McDougall, suffer more injuries than people th
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