Socioeconomic status and motivation in endurance sports: insights from long-distance running - Akbaş, Anna; Żebrowska, Aleksandra; Malchrowicz-Mośko, Ewa; Stempień, Jakub; Bezuglov, Eduard; Górka-Chowaniec, Agnieszka; Waśkiewicz, Zbigniew (Frontiers in Psychology, 2025)