Received: 1 July 2020
Accepted: 4 November 2020
First Online: 17 November 2020
Ethics approval and consent to participate
: The research project was conducted according to the Helsinki Declaration and was approved by the Ethics Committee for Scientific Research at the Jerzy Kukuczka Academy of Physical Education in Katowice, Poland. The participants provided their written voluntary informed consent before the participation.
: Not applicable.
: The authors declare that they have no competing interests.