bukheet Hassan, A. and abd ali hamza , H. 2023. The effect of competitive exercises on psychological resilience, some biochemical variables, and achievement of 400-meter hurdles runners for young men. ATTAKAMUL Journal of Social and Sports Sciences Researches. 7, 2 (Dec. 2023), 80-90. DOI:https://doi.org/10.34118/ajsssr.v7i2.3686.