1. Aspen Institute (2019) State of play 2019: trends and developments in youth sports. https://www.aspeninstitute.org/publications/state-of-play-2019-trends-and-developments/. Accessed 11 January 2021
2. National Federation of State High School Associations (2019) 2018-19 high school athletics participation survey. https://www.nfhs.org/media/1020412/2018-19_participation_survey.pdf. Accessed 11 January 2021
3. Koester MC (2000) Youth sports: A pediatrician’s perspective on coaching and injury prevention. J Athl Train 35(4):466–470
4. Hallal PC, Victora CG, Azevedo MR, Wells JC (2006) Adolescent physical activity and health. Sports Med 36(12):1019–1030
5. National Federation of State High School Associations (2020) The case for high school activities. https://www.nfhs.org/articles/the-case-for-high-school-activities/. Accessed 11 January 2021