My question would be, how does one know if you have a bad running genetic? Genetics will play a part to a degree such as your build and to some degree your motabolism etc. However, through training you can become a different type of runner. It will just be, like with anything, some people may be more setup for something than someone else.
Think about a swimmer, someone tall with big hands and feet may have an advantage over a smaller person, however that doesn't mean the smaller person will necessarily be slower.
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Think about a swimmer, someone tall with big hands and feet may have an advantage over a smaller person, however that doesn't mean the smaller person will necessarily be slower.