Participating in school activities helps students become more responsible and disciplined, guiding them to grow as better learners and individuals. Private schools provide activities such as sports, clubs, and academic programs to encourage personal growth and responsible behavior. These activities teach values like teamwork, focus, and respect for school rules, yet some students continue to show behavioral problems, raising questions about their effectiveness in improving discipline. This study examined the connection between school activities and student discipline in private schools. Data were collected from 100 Junior High School and Senior High School students using a quantitative correlational and descriptive design. A structured survey with five parts was administered: school activities, physical discipline, mental discipline, school discipline enforcement, and overall student discipline. Descriptive results showed that participation in school activities improved focus (WM = 4.00), responsibility (WM = 3.90), self-confidence (WM = 3.90), and following rules (WM = 3.64), all interpreted as Agree. Correlation analysis revealed significant positive relationships between school activities and discipline outcomes. Mental discipline (r = 0.61, p < 0.001) and physical discipline (r = 0.55, p = 0.002) showed moderate positive correlations, while discipline enforcement (r = 0.48, p = 0.010) indicated a low positive correlation. Overall student discipline was moderately correlated with school activities (r = 0.65, p < 0.001). These results confirm that school activities contribute to discipline, with varying levels of influence across different dimensions.

Keywords: School Activities, Student Discipline, Private Schools, Behavioral Development, Junior and Senior High School