DIFFERENCES IN PHYSICAL ACTIVITY OF ADOLESCENTS OF DIFFERENT SEXES BETWEEN 12 AND 15 YEARS OLD ON DIFFERENT DAYS OF WEEK . snp [Internet]. 2023 Aug. 31 [cited 2026 Jun. 11];13(1):13-20. Available from: https://test.aseestant.ceon.rs/index.php/snp/article/view/44828