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The purpose of this study was to examine the effects of 6-week agility ladder drills during recess time on dynamic balance ability in school boys. Seventy-one school boys (9.82±1.90 years; 1.38±0.13 m; 33.28±9.64 kg; BMI 17.25±3.18 kg m-2) were assigned randomly into a control (n= 37) and experimental (n= 34) groups. The experimental group performed 3 agility ladder training sessions per week for 6 weeks. Each training session included six sets of the training program which consisted of 6 exercises in the order of side jump, in and out, hopscotch, left and right leg hop, and icky shuttle, with 30 seconds rest between each set. Both groups were assessed using Star Excursion Balance Test (SEBT) before and after 6-week recess intervention. A statistically significant increase in post-training SEBT scores from 6.1% to 19.1% was seen in all directions for the experimental group, with a score that was better than the control group for both limbs. The dynamic balance ability of the school boys was significantly enhanced in 6-week agility ladder drills training after recess intervention.