Abstract
This study aimed to determine the cardiorespiratory fitness levels of elementary school girls in Sana'a, Yemen, aged 10-12 years, and to investigate the presence of differences in cardiorespiratory fitness levels by age group. The study sample consisted of 530 girls. The 20-meter shuttle run test was used to measure cardiorespiratory fitness. The current study found that the cardiorespiratory fitness levels were in the healthy range. with the 10-year-old age group having higher VO2max values. The study recommends the design of additional physical activity programs, in addition to those dedicated to physical education classes.