Ali Fattah Rashid Al-Obaidi, Khalid Abdlmagid Abdalhameed Alkhateeb. The Effect Of Progressive Activity Exercises On Developing Positive Thinking And Learning Some Basic Volleyball Skills. jess [Internet]. 2026 Jul. 30 [cited 2026 Sep. 4];7(2):199-212. Available from: https://publikasiilmiah.unwahas.ac.id/JESS/article/view/17320