39-year-old MS patient Derek Stefureac reverses disease progression through running marathons.

39-year-old Derek Stefureac was diagnosed with multiple sclerosis, a progressive disease affecting the nervous system. After being told that quitting smoking and improving his health would help slow the disease's progression, Stefureac, a former smoker and non-exerciser, began running marathons. His efforts have shown promise in reversing the disease's advancement, and he now shares his story to inspire others.