The effect of phosphorous-style exercises with a training mask on developing the maximum oxygen consumption (VO2 max) for football players under (20) years old. cbej [Internet]. 2025 Oct. 27 [cited 2026 Jun. 4];1(وقائع المؤتمر العلمي لكلية التربية الأسا):564-72. Available from: https://cbej.uomustansiriyah.edu.iq/index.php/cbej/article/view/13794