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http://www.bbc.co.uk/news/health-18863293 - Interesting, particularly the bit about trainers as I am about to purchase a new pair.
Professor Benno Nigg of the University of Calgary in Canada, has been studying the biomechanics of running for more than 40 years.
He said the conventional thinking was that cushioning and control were the key health benefits of running shoes - but that idea has been proven wrong by recent studies that showed no difference in injury rates if runners were prescribed structured shoes meant to control how their foot lands as they run.
"The most important predictors for injuries are distance, recovery time, intensity and those type of things... the shoes come very, very later as minor contributors.
Draw your own conclusions, I'd like to find the actual research that is alluded to.