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Open-Access License: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Address correspondence to this author at the Department of Motricity,
Human Performance and Sport Management. European University of
Madrid. C/ Tajo s/n, Villaviciosa de Odón, 28670 Madrid. Spain;
Tel: +34902232350; Fax: 0034-911413585;
E-mail: vicentejavier.clemente@uem.es