Action funded by the Ministry of Science and Higher Education under the contract number 916/P-DUN/2019 by funds dedicated to dissemination of research findings. Name of action: "Preparing for publication papers in English in 8 issues of the journal Quality in Sport in 2019-2020: Vol. 5, No. 1-4 (2019), Vol. 6, No. 1-4 (2020)".