I don't race or train at that level and I never will. Two things struck me about this short article. First, it sounds like the first time she has felt the feeling that so many of us have gone through after an untimely injury or very poor race performance. The build-up of energy without an outlet to release. Second, the attribution of the broken foot to a vitamin D deficeincy? It takes me completely by surprise that a runner with as many resources as Deena Kastor (nutritionists, therapists, coaches and trainers) could fall prey to the deficeincy of such a common vitamin. A vitamin that I probably overload on by accident because it is in so many of the foods that I eat while trying to maintain a healthy lifestyle and diet. My gut reaction says that doesn't pass the smell test.