Katarzyna Hyjek-Młynarczyk, K. , Iskra, J. and Piechota, K. 2020. ARM ACTION IN HURDLE CLEARANCE IN GROUPS OF DIFFERENT AGES AND SPORT SKILLS. Journal of Physical Education & Health. 9, 16 (Dec. 2020), 37-47. DOI:https://doi.org/10.5281/zenodo.5196142.