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Ali Fattah Rashid Al-Obaidi and Khalid Abdlmagid Abdalhameed Alkhateeb 2026. The Effect Of Progressive Activity Exercises On Developing Positive Thinking And Learning Some Basic Volleyball Skills. Journal of Education and Sport Science. 7, 2 (Jul. 2026), 199–212. DOI:https://doi.org/10.31942/jess.v7i2.17320.