Stankiewicz, Błażej, Jacek Stankiewicz, Peter Mandzák, and Martyna Kotyśko. “Physical Performance and Motivation to Exercise”. Journal of Education, Health and Sport 7, no. 5 (May 31, 2017): 654–689. Accessed September 1, 2024. https://apcz.umk.pl/JEHS/article/view/4563.