Abstract: Background: Back pain is one of the most common musculoskeletal disorders. Since it is difficult for patients with back pain to bear weight, a treatment that can strengthen the muscles of the lumbar region while losing weight is of great interest. Therefore, the purpose of this study was to compare the effect of eight weeks of traditional resistance training and TRX on the pain intensity of football players with non-specific chronic back pain. Methods: 45 elite soccer players aged 20 to 30 years with chronic back pain were purposefully selected and placed in 3 groups, TRX exercises, traditional exercises and a control group with 15 people each. Before and after the training session, pain intensity variable was evaluated by visual pain scale (VAS). In the following, the subjects of the experimental groups performed their respective exercises for 8 weeks and 3 sessions of 45 minutes each week, while during the same period, the subjects of the control group did not participate in any special exercise program and lived their daily lives. they did For the inferential analysis of the data, the statistical method of analysis of variance was used for repeated data (P = 0.05). Results: In the intra-group comparison, a significant effect on pain intensity was observed in both traditional and TRX groups, but no significant difference was observed in the control group. The findings showed that in the intergroup comparison between the intervention groups compared to the control and between the two intervention groups, a significant difference was observed in the variables of pain intensity, so that the TRX exercise group had more effect and effect size than traditional exercises. Conclusion: In general, the results of this research showed that the TRX training program has a significant effect in improving pain intensity compared to traditional training. پرونده مقاله