Dina and other elite athletes represent the pinnacle of human physical performance. By definition, not everyone has the potential to become an exceptional athlete. However, many high achievers appear to have certain genetic, physical, and psychological features. They are usually young when they first begin competing at a high level, and most have no family history of athletic achievement. The majority of elite athletes are male. The average age at which males start training seriously for competition is 15-19 years old. Female athletes tend to start training later (average age 21-23) and may continue with their sport into older ages. Elite athletes come from all races and ethnic groups. However, they tend to be members of one of three major categories: black, white, or other (usually east Asian). This is probably due to the fact that these are the racial categories used by most sports organizations around the world. It is difficult to say what causes some people to become elite athletes while others do not. Perhaps it has something to do with genetics, but also environment plays a role. Elite athletes are likely to have had parents, teachers, coaches, and sponsors who have helped them reach their potential. Some individuals may even change their life around to pursue an athletic career. For example, Carl Lewis was raised by single mother who worked long hours as a nurse.