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What are among their undesirable? Well for one, NOT bending the knees enough; which creates a lot of impact towards the ankles and knees. And two, developing the practice of landing during 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 whole of the leg, begining with the heal, and sending it up through the knee. Not good, and a major debate that runner's in padded, expensive shoes, claims McDougall, suffer more injuries