High-school wrestler Derek DiManno stopped pinning his opponents in college when he decided to focus on his studies instead. After achieving a master’s degree, Derek stepped back into the ring—this time learning Brazilian Jiu Jitsu. Studying under a world champion, Derek himself picked up a slew of championship awards, and earned a black belt in the sport. He opened his own martial-arts school to bestow others with the knowledge and skills of self-defense techniques. His classes for kids teach basic moves with the aim of boosting students’ self-discipline, sportsmanship, and social skills. Adult classes challenge students of all fitness abilities, and special law-enforcement classes teach police how to take down criminals without the use of a weapon.