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What are a few of their undesirable habits? Well for one, NOT bending the knees enough; which causes a lot of impact at the ankles and knees. And two, developing the habit of landing relating to the heel, rather than forefoot. This, basically stops the runner's forward momentum, and 'puts the brakes on.' Also, it sends a 'shock' through the entire leg, begining with the heal, and sending it up through the knee. Not good, in addition to major belief that runner's in padded, expensive shoes, claims McDougall, suffer more injuries t