BRITISH JOURNAL OF SPORTS MEDICINE British Journal of Sports Medicine, 57 (5), 299–310 British journal of sports medicine, 57(5):299-310 FitBack, HELENA and IDEFICS consortia 2023, ' European fitness landscape for children and adolescents : updated reference values, fitness maps and country rankings based on nearly 8 million test results from 34 countries gathered by the FitBack network ', British journal of sports medicine, vol. 57, no. 5, pp. 299-310 . https://doi.org/10.1136/bjsports-2022-106176 British journal of sports medicine, 57(5), 299-310