Desy Tya Maya Ningrum, Hafizah, Danang Aji Setyawan, Yafi Velyan Mahyudi
Introduction: Students in their teens must gain physical fitness and be able to manage their body composition. Objective: A structured physical activity program affects body composition and physical fitness. Methodology: The research employed an experimental method. The sample consisted of 60 junior high school students. Stratified random sampling was used, considering gender, BMI, and initial physical fitness levels. The structured physical activity intervention program was implemented thrice weekly for 60 minutes per session. Results: Independent t-test showed significant push-up, sit-up, and VO2 max increases among post-test students (p < 0.05). Paired t-test results between pretest and posttest assessments revealed t-values exceeding p-values. Significant differences emerged between the experimental and control groups (p = 0.033). The experimental group demonstrated lower BMI with a difference of 1.04, showing a moderate effect size (d = 0.563). Body fat percentage was significantly lower in the experimental group (p = 0.017) with a difference of 0.36% and a moderate effect size (d = 0.634). Visceral fat showed highly significant differences (p = 0.003), with the experimental group achieving greater reduction (difference of 1.00) and large effect size (d = 0.806). All variable pairs exhibited significant relationships, with correlation strengths ranging from strong (0.884-0.937) to very strong. Discussion: The findings demonstrate that a structured physical activity program incorporating fundamental movement skills development, circuit training, and sport-based activities provides multiple benefits for students. Conclusion: The intervention effectively improved physical fitness parameters and positively altered body composition metrics, suggesting valuable applications for school-based physical education programs. © 2025 Federacion Espanola de Docentes de Educacion Fisica. All rights reserved.
Universitas Bhayangkara Jakarta Raya, Indonesia; Universitas PGRI Semarang, Indonesia; Universitas Negeri Jakarta, Indonesia
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