<![CDATA[This research is driven by the need to identify the specific physical and psychological factors that influence the underhand passing performance of extracurricular volleyball students at High School 8 Bulukumba. The primary objective is to analyze the impact of hand-eye coordination, leg muscle strength, and self-confidence on this fundamental skill. Employing a quantitative methodology, the study utilized a purposive sampling technique to select 20 participants. Data were gathered through structured physical assessments and psychological questionnaires, then analyzed using multiple regression and t-tests. The empirical results indicate that all three variables significantly affect performance, both partially and simultaneously. Hand-eye coordination contributes 86% to passing ability (t = 2.304, p = 0.035), while leg muscle strength contributes 89.2% (t = 2.792, p = 0.013) as a vital foundation for body stability. Notably, self-confidence emerged as the most dominant factor, contributing 90% (t = 4.252, p = 0.001), confirming that psychological maturity is directly proportional to technical accuracy. Collectively, these three variables account for 96.1% of the variance in underhand passing skills. These findings offer a strategic framework for coaches to integrate mental fortitude with physical conditioning to effectively enhance the technical proficiency and competitive readiness of student-athletes.]]>
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