Background and Purpose: The aim of this study was to meta-analyze the studies conducted on the effectiveness of two high-intensity and low-intensity morning exercise training methods on physical fitness indices. For the present study, two factors of physical fitness including aerobic strength and muscle strength were selected. Method: The method of this research is meta-analysis. The statistical population of the study includes all Persian scientific research journals and English ISI that have studied the effect of morning exercise on physical fitness. Initially, 305 and after a closer look, 96 related articles were identified. Finally, by reviewing the full text of the articles, a total of 19 articles were systematically reviewed. For statistical analysis, the mean changes of FMD in each group were compared and the standard deviation of the mean changes was calculated using the reported p-value, T-statistic and standard error. Statistical analysis was performed using STATA software. To analyze the findings, the difference between the means of the extracted results and the metan command was used, and to investigate the heterogeneity, the chi-square test and the I2 index in the software were used. findings: Findings of Meta-Analysis 8 Studies on aerobic power showed that morning exercise improves aerobic power whether high or low intensity. The results of a meta-analysis of 11 studies on muscle strength also showed that morning exercise, whether high-intensity or low-intensity, improved muscle strength. Results: However, in comparison with high-intensity morning exercise and low-intensity morning exercise, the effect of high-intensity morning exercise on physical fitness factors was significantly greater. However, some studies have shown that high-intensity morning exercise has a negative effect on physical health, so it is better to do low-intensity morning exercise, which in addition to improving physical fitness factors, also improves physical health.