A. Chruścińska, O. Smoleńska, R. Muszkieta, M. Hagner-Derengowska, and A. Michalska, “Age-Related Differences in Motivations and Barriers to Physical Activity: A Cross- Sectional Analysis Across the Lifespan”, J Educ Health Sport, vol. 91, p. 71870, May 2026.