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. 2026 Apr 27;8:1799878. doi: 10.3389/fspor.2026.1799878

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© 2026 Hanstad, Skille, Johansen and Strittmatter.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Stacked bar chart illustrating monthly participation in various football-related activities. Categories include team training, unorganized football alone, unorganized football with friends, physical education, matches, private academy, football joy schoolyard, other activity. January and October show the highest total activity, while April is the lowest. Each bar shows the relative contribution of each category throughout the year, with team training and other activity consistently present. Data type is categorical frequency by month, useful for comparing seasonal variation in football activity engagement. — Activity divided by month and activity type for one year (2016) for a 13-year-old football player who later became a professional at the highest level in Norway (total 733 h of activity; see Supplementary Table 1 for monthly hours in each category).