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Running barefoot may be healthier, say scientists
http://www.independent.co.uk/news/science/running-barefoot-may-be-healthier-say-scientists-1881341.html
However, he (Professor Lieberman) cautions: "Running barefoot or in minimal shoes is fun but uses different muscles. If you've been a heel-striker all your life you have to transition slowly to build strength in your calf and foot muscles."