<![CDATA[This study aims to examine the effect of volleyball learning on students’ gross motor development, which constitutes a crucial aspect in supporting adolescents’ physical fitness and movement skills. The research problem arises from the low level of students’ gross motor abilities, as indicated by weak coordination, agility, balance, and muscle strength, resulting from limited structured physical activity and the dominance of conventional teaching approaches. A quantitative approach was employed using a quasi-experimental pretest–posttest control group design to evaluate the effectiveness of systematically designed volleyball instruction. The findings reveal a significant improvement in the experimental group, with the mean score increasing from 64.28 to 78.45, while the control group showed only a modest increase from 63.91 to 68.12. Statistical analysis indicates a significant difference with a t-value of 6.214 and a significance level of 0.000, supported by an effect size of 1.28, which falls into the large category. These results confirm that volleyball-based learning is effective in enhancing overall gross motor skills through structured and varied movement activities. The novelty of this study lies in its comprehensive approach that integrates multiple motor components within a unified analytical framework, as well as the use of effect size to strengthen the practical significance of the findings. This study provides a meaningful contribution to the development of more innovative, interactive, and movement-based physical education learning models to optimize students’ motor development sustainably.]]>
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