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What are a couple of their unpleasant? Well for one, NOT bending the knees enough; which causes a lot of impact close to the ankles and knees. And two, developing the practice of landing during the heel, instead of the forefoot. This, basically stops the runner's forward momentum, and 'puts the brakes on.' Also, it sends a 'shock' through the total leg, ranging from the heal, and sending it up through the knee. Not good, which includes major reason that runner's in padded, expensive shoes, claims McDougall,