This study investigates the effectiveness of circuit training in enhancing muscle endurance among fifth-grade boys in a primary school setting. 50 male students were randomly selected, with 25 assigned to the control group and the remaining 25 to the experimental group. The intervention program, consisting of shuttle runs, sit-ups, and burpees, was conducted for 8 weeks. An independent t-test showed a significant difference (p<0.05) between the mean scores of the control and experimental groups. The study contributes to existing knowledge on the benefits of circuit training for muscle endurance among young boys. The intervention program targeted various muscle groups and improved overall endurance. The use of intact sampling ensures the study\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\'s representativeness of the broader population of standard five boys in primary schools. The random assignment of students to control and experimental groups minimizes potential bias and increases the reliability of the study\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\'s results. These findings can be used by physical education instructors, school administrators, and policymakers to develop targeted exercise programs that enhance the physical fitness levels of primary school students.