In 1921 Rivne county became a part of Volhynian province of the second Polish Republic. Some communes of the Rivne county were on 1 January 1925 made into Kostopil county. A significant majority of the county was the Ukrainian population. The second and third national group was composed of Polish and Jewish communities. Rivne county was also inhabited by other communities including Czech, German and Russian ones. The years 1921–1939 saw the development of physical education and sport in Rivne and Rivne county, among others of sports infrastructure as well as training of personnel for physical education and sport. An important role in the development of physical activity was played by youth organizations and associations including: Gymnastic Society “Sokół” [“Falcon”], Volhynian Association of Rural Youth and Shooting Association. A significant role in sports activities was played by sports clubs. The sports structures established in Volyn, among others Rivne-based district sports associations, were conducive to the development of this field of physical culture. Physical education and sport were practised among the Ukrainian population, in Volyn such organizations as “Płast” and “Junak” stood out.