Every time Kayla Montgomery crosses the finish line, she collapses into her coach’s arms. Her legs are completely numb, so much so, that she pleads with her team to “find” her legs as they place ice packs on her to cool her down. At 18, Kayla is one of the top distance runners in the U.S, but she also suffers from a debilitating disease called “MS” or Multiple Sclerosis.