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What are a couple of their improper habits? Well for one, NOT bending the knees enough; which leads to a lot of impact around the ankles and knees. And two, developing the habit of landing across 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 general leg, beginning the heal, and sending it up through the knee. Not good, and a noticeably major reasons why runner's in padded, expensive shoes, claims McDougall, suffer more injuri