Amateur Wrestling, is the most widespread form of sport wrestling. There are two international wrestling styles performed in the Olympic Games under the supervision of United World Wrestling: Greco-Roman and freestyle. Freestyle is possibly derived from the English Lancashire style. A similar style, commonly called collegiate (also known as scholastic or folkstyle), is practiced in colleges and universities, secondary schools, middle schools, and among younger age groups in the United States. Where the style is not specified, this article refers to the international styles of competition on a mat. The rapid rise in the popularity of the combat sport Mixed martial arts has increased interest in amateur wrestling due to its effectiveness in the sport and it is considered a core discipline.