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What are their bad habits? Well for one, NOT bending the knees enough; which causes a lot of impact for a ankles and knees. And two, developing the habit of landing on 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 sum of the leg, beginning the heal, and sending it up click through the next article the knee. Not good, one-time offer as well as major consider that runner's in padded, expensive sh...