TRAINING AND FITNESS VARIABILITY IN ELITE YOUTH SOCCER: PERSPECTIVES FROM A DIFFICULTY PREDICTION MODEL. Kinesiology, [S. l.], v. 54, n. 1, p. 25–35, 2022. Disponível em: https://ojs.srce.hr/index.php/kinesiology/article/view/16714. Acesso em: 20 aug. 2025.