“When I went back and compared motivation styles to performance improvement over each athlete’s career, one factor stood out. Those who scored high in a particular type of extrinsic motivation called external regulation had lower improvement rates. External regulation is defined as when “the sport is performed not for fun but to obtain rewards (e.g., praise) or to avoid negative consequences (e.g., criticisms from parents).” The five highest-ranked athletes in external regulation were five athletes who showed the least amount of improvement.”