http://www.charliehellman.com/....is-english-the-only-
What are some of their less than comfortable habits? Well for one, NOT bending the knees enough; which leads to a lot of impact towards the ankles and knees. And two, developing the practice of landing with 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 an entire leg, starting with the heal, and sending it up through the knee. Not good, in addition to major consider that runner's in padded, expensive shoes,