Figure 3. Effect of the physical education-based stretching intervention program on hamstring extensibility according to the children’s flexibility baseline (classic sit-and-reach scores, cm). The values represent the mean and the error bars the standard error. Between-groups pairwaise comparisons: Statistically significant differences between the low/ normal groups and the control group (* p < 0.05; *** p < 0.001) and between the low group and normal group (### p < 0.001).