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Article History

Received: 10 January 2020

Accepted: 15 April 2020

First Online: 25 April 2020

Ethics approval and consent to participate

: The study was approved by the Ethical Committee of The Jerzy Kukuczka Academy of Physical Education, in Katowice, under reg. no 2/2008. All the participants, their parents, and school administrators consented to the research in writing. At the beginning, the participants received detailed information on data confidentiality and security in Indares and on the way of data processing and publishing. The participants could quit PA monitoring any time during the research. Loss of pedometers was not sanctioned at all. All the participants obtained individual feedback on their weekly PA composition and summary aggregated information on rates of meeting the steps/day recommendation by boys and girls in their class, as did school administration.

: Not applicable as consent has been obtained for data collection and no identities will be disclosed.

: The authors declare no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.ORCID.<i>Karel Fromel</i> () is a professor and head of the Institute of Active Lifestyle, Faculty of Physical Culture, Palacký University Olomouc. His research focuses on physical education, physical activity, lifestyle, and methodology.<i>Dorota Groffik</i> () is a professor at the Jerzy Kukuczka Academy of Physical Education in Katowice. Her research focuses on physical education, school health, school policy, and physiotherapy.<i>Petr Badura</i> () is a researcher at the Faculty of Physical Culture, Palacký University Olomouc. His research focuses on adolescents’ leisure time, organised activities, lifestyle and physical activity.