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http://www.runnersworld.com/tag/plantar-fasciitis

This article was very interesting. It talks about the common running injury, plantar fasciitis. It explains how it is caused by over working your feet. The feet are very delicate creatures. If they dont have the proper support you can be prone to injuries. This specific injury deals with the ligaments at the bottom of your foot stretching from your heel to slightly past your arch. It is commonly caused by over use, or a drastic increase in mileage. But its mostly due to using bad shoes. An over used shoe or a shoe that doesnt fit you properly can cause you to pronate or supinate which causes you to over work. This can cause a lot of problems no only plantar fasciitis.