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Publicado en línea: 03 jun 2019
Páginas: 1 - 5
Recibido: 10 nov 2018
Aceptado: 11 feb 2019
DOI: https://doi.org/10.2478/pcssr-2019-0008
© 2019 Ejgil Jespersen, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Ejgil Jespersen
Józef Piłsudski University of Physical Education in Warsaw,
Department of Health ScienceBiala Podlaska, Poland