This study aimed at determining the effect of an eight-week concurrent strength and endurance training program on the body composition (total body water percentage, fat free body mass and body fat percentage) and aerobic power of non- athletic male students. Fifty non- athletic male students with the age mean of 21.18±2.1, height mean of 176.34±4.1 and weight mean of 70.1±5.4 were randomly divided to five concurrent endurance- strength (n=10), concurrent strength-endurance (n=10), strength (n=10), endurance (n=10) and control (n=10) groups. In three sessions (week 0, week 4 and week 8), their aerobic power and body composition were measured in order to obtain their maximum oxygen consumption, total body water percentage, fat free body mass and body fat percentage. Then, the training groups performed their training programs for eight weeks, three sessions per week. The training program of the strength group included circular strength. The endurance group performed running with 70-80% maximum heart rate for 20-26 min. The program of the concurrent endurance-strength group was composed of doing endurance training first and strength training next and that of the concurrent strength-endurance group included performing strength training first and endurance training next. The control group did not participate in any training program during the research period. The research data were analyzed using Analysis of Variance (ANOVA) with repeated measures along with dependent t test considering the Bonferroni's P correction for within group evaluation and one way Analysis of Variance (ANOVA) along with Tukey’s post hoc test for between group evaluation (α <0/05). The results showed that eight weeks of endurance training, concurrent endurance-strength training and concurrent strengthendurance training significantly increased the maximum oxygen consumption (P<0.05). Also, total body water percentage significantly increased after eight weeks of strength, endurance, concurrent endurancestrength and concurrent strength-endurance training (P< 0.05). Fat free body mass increased in the concurrent endurance-strength, concurrent strength-endurance and strength groups; however, this increase was only significant soma discount in the strength group. Body fat percentage had significant decrease in the four experimental groups but this decrease was more evident in the concurrent endurance-strength and concurrent strength-endurance groups compared with the strength and endurance groups (P<0.05).Considering the research findings, people can perform learn about concurrent strength-endurance training in order to highly decrease their body fat percentage. In sum, it can be concluded that doing concurrent strength-endurance training is more helpful for decreasing fat and controlling weight and this kind of concurrent training can be recommended to people.
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