After a car accident left her with a shattered wrist that cut her gymnastics career short, Madi Williams decided use her knowledge of the sport and coaching experience to help others. With the help and support of her parents, Madi founded "All Star Gymnastics" in Wilder, Ky., a gymnasium that she has owned and operated for about a year.To learn the full story of how Madi founded her own gym at age 21, watch the video above.