Półtoranos M, Perkowski R. Assessment of physical fitness of young rugby players of the club „MKS Ogniwo Sopot" after a year of systematic training. J Educ Health Sport [Internet]. 2024 Jun. 6 [cited 2024 Jun. 30];61:51862. Available from: https://apcz.umk.pl/JEHS/article/view/51862