What are some of their annoying? Well for one, NOT bending the knees enough; which creates a lot of impact on ankles and knees. And two, developing the practice of landing during the heel, as opposed to the forefoot. This, basically stops the runner's forward momentum, and 'puts the brakes on.' Also, it sends a 'shock' through all leg, originating in the heal, and sending it up click through the up coming document the knee. Not good, in addition to major consider that runner's in padded, expensi...