english: In the 1960s, Dr. Frank Hayden, a scientist at the University of Toronto, was studying the effects of regular exercise on the fitness levels of children with intellectual disabilities.
non_english: Šezdesetih godina 20. veka, dr Frank Hejden, naučnik na Univerzitetu u Torontu, proučavao je efekte redovne vežbe na nivo fizičke spreme dece sa intelektualnim smetnjama.