Analysis of an intergenerational service-learning experience based on physical exercise in a community setting: a mixed-method study - Alonso-Cortés Fradejas, Beatriz; Lafuente-Ureta, Raquel; Calvo, Sandra; Fernández-Gorgojo, Mario; Poveda-López, Jose Lesmes; Jiménez-Sánchez, Carolina (Frontiers in Public Health, 2025)