RT Journal Article T1 Effectiveness of a High‐Intensity Interval Games Program in Extra‐Curricular Context (MOVI‐daFIT!) on Gross Motor Competence and Health‐Related Quality of Life in Primary Schoolchildren: Cluster‐Randomized Trial A1 Fernández Sánchez, Pablo Antonio A1 Sánchez López, Mairena A1 Ruiz Hermosa, Abel A1 Redondo Tébar, Andrés A1 Pozuelo Carrascosa, Diana P. A1 Jiménez López, Estela A1 Martínez Vizcaíno, Vicente AB High‐intensity interval training (HIIT) has emerged as a time‐efficient approach to improve aerobic capacity, cardiovascularhealth, and cognitive functioning in children and adolescents. However, evidence regarding the impact of school‐based HIITprograms on motor competence and health‐related quality of life in children is limited. This study evaluated the effectiveness ofa HIIT intervention, based on playground games on gross motor competence and health‐related quality of life in schoolchildrenaged 9–11 years. A cluster‐randomized controlled trial was conducted with 562 participants. The intervention involved fourweekly 60 min sessions of extracurricular physical activity using traditional games adapted to a HIIT protocol. Gross motorcompetence and health‐related quality of life were assessed using the Movement Assessment Battery for Children‐SecondEdition (MABC‐2) and the KIDSCREEN‐27 questionnaire, respectively. Analyzes were conducted on an intention‐to‐treatbasis using mixed linear regression models to compare changes from baseline to postintervention between the interventionand control groups. No significant improvements in gross motor competence or health‐related quality of life were observed afteradjusting for baseline variables, age, sex, and school. The results suggest that this HIIT‐based program was not effective inenhancing gross motor competence or in improving health‐related quality of life. Future programs could improve effectivenessby optimizing the balance between movement intensity and quality, aligning activities with gross motor competence assessmenttools, emphasizing health‐related quality of life components, training educators to enhance quality of life, extending interventionduration to impact self‐esteem and psychological well‐being, and improving adherence rates AB The Ministry of Economy and Competitiveness‐Carlos III Health Institute (FIS PI16/01919) funded this study. Additional funding was obtainedfrom the Research Network on Preventative Activities and Health Promotion (RD12/0005/0009). Open Access funding was provided by the Universidad deCastilla‐La Mancha PB Wiley SN 1746-1391 SN 1536-7290 (electrónico) YR 2025 FD 2025-05 LK https://hdl.handle.net/10272/25563 UL https://hdl.handle.net/10272/25563 LA eng NO Fernández‐Sánchez, A., Sánchez‐López, M., Ruiz‐Hermosa, A., Redondo‐Tébar, A., Pozuelo‐Carrascosa, D. P., Jiménez‐López, E., & Martínez‐Vizcaíno, V. (2025). Effectiveness of a High‐Intensity Interval Games Program in Extra‐Curricular Context (MOVI‐daFIT!) on Gross Motor Competence and Health‐Related Quality of Life in Primary Schoolchildren: Cluster‐Randomized Trial. European Journal of Sport Science, 25(6). https://doi.org/10.1002/ejsc.12308 NO The Ministry of Economy and Competitiveness‐Carlos III Health Institute (FIS PI16/01919) funded this study. Additional funding was obtained from the Research Network on Preventative Activities and Health Promotion (RD12/0005/0009). Open Access funding was provided by the Universidad de Castilla‐La ManchaThe authors thank the schools, families, and children for their enthusiasticparticipation in the study. The authors thank all members of theCuenca Study Group who helped make this study possible. Members ofthe Cuenca Study Group: Carlos Berlanga‐Macías, Blanca Notario‐Pacheco, Ana Díez‐Fernández, María Jesús Pardo‐Guijarro, María Eugenia Visier‐Alfonso, Celia Álvarez‐Bueno, Marta Nieto‐López,Alberto González‐García, Jorge Cañete García‐Prieto, Ana Torres‐Costoso, Antonio García‐Hermoso, Caterina Pesce, and RicardoCuevas‐Campos. The authors also thank the University of Castilla‐LaMancha for providing Open Access funding DS Repositorio Institucional de la Universidad de Huelva RD 30 may 2026