Andriichuk O, Zadvorniy B. Active flexibility in girls before and after the annual cycle of stretching classes. Pedag Psychol Sport [Internet]. 2020 Oct. 10 [cited 2025 Jun. 30];6(3):117-26. Available from: https://apcz.umk.pl/PPS/article/view/PPS.2020.06.03.009