THE EFFECTIVENESS OF USING KEELER’S STRATEGY IN SINGLING OUT EDUCATION ON THE LEVEL OF PERFORMANCE OF SOME BASIC SKILLS IN BELLY CRAWL SWIMMING FOR BEGINNERS. World Bulletin of Social Sciences, [S. l.], v. 11, p. 79–93, 2022. Disponível em: https://scholarexpress.net/index.php/wbss/article/view/1085. Acesso em: 18 jan. 2026.