http://halinalarsson.com/why-is-queen-so-popular/
What are a couple of their undesirable? Well for one, NOT bending the knees enough; which results in a lot of impact on ankles and knees. And two, developing the habit of landing by 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 the whole of the leg, begining with the heal, and sending it up through the knee. Not good, in addition to major reason that runner's in padded, expensive shoes, claims McDougall, suffer more injuries than people