bukheet Hassan, A., and H. abd ali hamza. “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, Vol. 7, no. 2, Dec. 2023, pp. 80-90, doi:10.34118/ajsssr.v7i2.3686.