http://www.novelconception.com..../do-i-need-a-smart-p
What are a handful of their undesirable? Well for one, NOT bending the knees enough; which results in a lot of impact around the ankles and knees. And two, developing the habit of landing across the heel, rather than forefoot. This, basically stops the runner's forward momentum, and 'puts the brakes on.' Also, it sends a 'shock' through all leg, starting from the heal, and sending it up through the knee. Not good, and a noticeably major belief that runner's in padded, expensive shoes, claims McDougall, suffer more injuries than pe