“EFFECTS OF PLYOMETRIC TRAINING IN SAND OR RIGID SURFACE ON PHYSICAL-PERFORMANCE RESPONSES AND TESTOSTERONE CONCENTRATION IN FOOTBALL PLAYERS”. Proximus Journal of Sports Science and Physical Education 1, no. 3 (March 30, 2024): 16–29. Accessed November 19, 2024. https://proximusjournal.com/index.php/PJSSPE/article/view/34.