Exercise is good for you. This feels universally true. Turns out, it’s not. For Melissa Guarnaccia, running marathons in her 20s was a healthy outlet and stress release, until the day her heart stopped beating and she collapsed on her front steps. As it turns out, the activity she loved most was destroying her body and taking years off her life. Stephanie talks with Melissa about living with massive uncertainty, and how her condition forces life-or-death decisions for her and her family every day.

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