Aggression in sport is in general defined by Kerr (1999) as an intentional hurting of the opponent, which exceeds the limits set by the rules of a specific type of sport. Slepička, Hošek, and Hátlová (2009) differentiate the groups of specific sports from the point of view of aggressive behavior appearance: sports where aggression is an essential part of sports performance (combat sports), sports where aggression is not part of sports performance, but it may appear (e.g., football, basketball), sports in which is not expected an increased level of aggression, but may appear rarely (e.g., cycling, athletics), sports, that do not allow direct physical contact (e.g., swimming, tennis, volleyball) and aesthetic-coordinating sports (e.g., figure skating, synchronized swimming, gymnastics). Scientific studies focused on aggression in sports divide it into instrumental and hostile type.