SOUTHFIELD, Mi (TV 20 News at Ten) --- More and more people are signing up to run marathons and 5K's. But it's important to know that while its a great exercise it can also cause you medical complications if you're body is not is not ready for it.
In some cases runners have collapsed and died during local runs. My TV 20's Jorge Avellan spoke with a doctor about this issue and has the story.
Plus: hear why some runners are visiting their doctor before a big run.
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