Based on a true marriage journey, Extraordinary tells the amazing story of ultra-marathon runner and college professor David Horton, his wife, Nancy, and their attempt to finish their marriage race well. Although proud of his incredible athletic accomplishments and the impact he has on his students, David's family continuously pays a high price for his years of competitive running. Following his open-heart surgery and irreparable damage to his knees, Nancy is ready for Dave to hang up his racing shoes for good and focus his boundless energy on their family. Instead, feeling called by God to "inspire people one last time," Dave sets off for a 2,900-mile race across America.