<![CDATA[This study aims to determine the effect of aerobic exercise on improving cardiovascular function and coordination in early childhood sports training. This study employed a pre-experimental design with a One-Group Pretest-Posttest Design, utilizing a single group of subjects. The population and sample for this research and development consisted of athletes registered in a volleyball club in Sleman Regency. The sampling technique used was purposive sampling, with the following inclusion criteria: female volleyball athletes, willingness to participate as samples, aged 10–12 years, and a minimum training experience of 6 months. Based on the paired samples t-test analysis, the calculated t-value was greater than the t-table value, with a p-value (0.000) < 0.05. These results indicate that the calculated t-value is significantly larger than the t-table value. Consequently, there is a significant effect of aerobic exercise on improving cardiovascular function and coordination in early childhood sports training.]]>
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