When the starting gun sounds at Mount Tabor High School track meets, senior Kayla Montgomery from Winston-Salem, N.C., takes off.
The 18-year-old runner sets records, wins state titles, and next week, she's headed to nationals in New York.
But when Montgomery runs, her legs go totally numb. She has multiple sclerosis, a disease that causes nerve damage and interference in communication between her brain, spinal cord and legs.