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What are a couple of their undesirable habits? Well for one, NOT bending the knees enough; which results in a lot of impact at the ankles and knees. And two, developing the habit of landing over a 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 sum of the leg, starting from the heal, and sending it up through the knee. Not g