Have you seen the running shoes from FBR? They don't have a heel. It made me wonder if there was an advantage of not having a heel in terms of the weight that was saved by having no heel. I look at an article showing the effect of the weight of the shoe on running economy and a guy who did a slightly crazy experiment which involved cutting up his running shoes. I look at the results from both these studies. I also briefly look at a paper showing the effect of movement on the production of immune cells to fight infection.

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