Background: The use of different kinds of dietary supplements is rising dramatically on a global scale these days. These substances include multifunctional performance-enhancing supplements, herbal supplements, and everyday vitamins. The main objective of this research is to find out how bodybuilding athletes' performance quality, muscle efficiency, and degree of satisfaction are affected by sports supplements. Materials and Methods: This study used a survey approach conducted in the field using a standardized questionnaire in conjunction with a descriptive-analytical research design. The study's statistical population included 131 participants who were among the top ten bodybuilding competitors at national championships. For statistical analysis, Friedman and linear regression tests were used after the data was collected. Results: The study results suggest that the majority of respondents concur that the use of sports supplements directly affects the functioning of body muscles. Moreover, the prolonged use of supplements that enhance weight and muscle volume has an increased effect on the performance of these athletes. The benefits of sports supplements are particularly noticeable throughout the second to fourth years of training for bodybuilding athletes as they continue to use these supplements. Conclusion: Evidence suggests that sports supplements have a discernible influence on muscle efficiency and the performance of bodybuilding athletes. Nevertheless, the use of sports supplements does not have a substantial impact on athlete satisfaction. Manuscript profile

Background: The Aim of The Study Was to Investigate the Effect of Selected Taekwondo Exercises and Ginseng Supplement Consumption on Body Composition and Some Selected Factors of Physical and Movement Fitness of Overweight Girls. Materials and Methods: The Research Is a Semi-Experimental Research That Was Conducted in The Field Method, For This Purpose, 28 Overweight Girls Interested in Taekwondo in Tehran, Who Had At Least Three Years of Taekwondo Experience. By Cluster Sampling Method and Using G-POWER Software, They Were Selected Purposefully and Randomly Divided Equally in to Four Experimental and Control Groups of Seven People. Taekwondo Training Program as Well as HIIT Training Program Including 8 Weeks of Training Were Implemented. HIIT Training Includes a rest Test, Meaning 6 Intervals Of 35 Meters, With A 10-Second Rest At The End Of Each Interval. After Eight Weeks of Training, All Dependent Variables of The Research Were Measured Using Standard Tests in The Statistics Section, T Test, Variance Analysis and LSD Post Hoc Test Were Used. Results: The Results of One-Way Analysis of Variance (ANOVA) Showed that the Percentage of Body Fat in The Experimental Groups Decreased Compared to The Control Group and Showed a Significant Difference (P≤0.05). Also, In the Supplement Group, Due to The Consumption of Ginseng Supplement and Its Relationship with The Increase in Muscle Volume and Strength, An Increase in Sargent's Jump Was Reported (P≤0.05). Conclusion: It Was Found that the Reason Can Be Considered the Nature of The HIIT Exercise That Has Been Performed Under High Pressure. Manuscript profile