Brunner, Friedrich, Elmar Kornexl, Hannes Kasnter, Clemens Drenowatz, and Klaus Greier. “Fitness Trend Analysis in Male Austrian Middle and High School Students from 1975 to 2010”. Current Issues in Sport Science (CISS) 6 (May 27, 2021): 007. Accessed April 19, 2024. https://ciss-journal.org/article/view/7744.