en آسیب شناسی ورزشی و حرکات اصلاحی Sport injury and corrective exercises پژوهشي Research <div style="text-align: justify;"><strong>Purpose</strong>: Previous research indicates a positive correlation between the forward head and forward shoulder angle (FHRSA) and the maintenance of a flexed neck position over an extended period, leading to static stress on the musculoskeletal system. This study aimed to ascertain the benefits of a course of training on flexion-relaxation in male adolescents with forward head and forward shoulder postures.&nbsp;<br> <strong>Methods</strong>: Sixty males with FHRSA were selected for the current study and split into two groups: Corrective exercise (CE) (n=30) and non-treatment group (n=30). The intervention group underwent training. Exercises were performed twice a week for approximately 20-30 minutes, while the control group received advice on how to correct posture. Electromyography data of the upper extremities of 60 participants with FHRSA (control=30, CE=30) were recorded. At the same time, participants in both groups performed the cervical flexion&ndash;relaxation task under two different conditions (before and after the intervention). The forward head and shoulder angles were evaluated using side photography. A mixed repeated-measures analysis of variance (ANOVA) was utilized for data analysis.<br> <strong>Results</strong>: Significant time&times;group interactions were observed for electromyography (P<0.05), indicating that the response differed between the control and CE groups. CE, but not the control condition, was accompanied by a decrease in the onset time of muscle activation, indicative of improved flexion-relaxation (P<0.05). CE, but not so in the non-treatment group, resulted in a decreased forward head angle (FHA) (F [12, 0], P<0.001, ղp&sup2;=0.172) and rounded shoulder angle (RSA) (F[15, 4], P<0.001, &eta;p&sup2;=0.211).<br> <strong>Conclusion</strong>: CE can improve posture and flexion relaxation in individuals with forward head and rounded shoulders. Additionally, CE can improve posture and reduce muscle imbalances in individuals with FHRSA.</div> Exercise therapy, Posture, Postural balance forward head, Forward shoulder, Electromyography 307 322 http://ptj.uswr.ac.ir/browse.php?a_code=A-10-656-1&slc_lang=en&sid=1 Ainollah Sakinepoor asakenapoor@yahoo.com 0000-0003-4008-562X Yes Department of Physical Education, Farhangian University, Tehran, Iran. Hans Degens h.degens@mmu.ac.uk 0000-0001-7399-4841 No Department of Life Sciences, Manchester Metropolitan University, Manchester, United Kingdom. Amir Letafatkar letafatkaramir@yahoo.com 0000-0002-5612-8340 No Department of Biomechanics and Sport Injuries, Faculty of Physical Education, Kharazmi University, Tehran, Iran. Mohammad Z. Darabseh darabseh.moh@gmail.com 0000-0002-0535-0195 No Department of Physiotherapy, School of Rehabilitation Sciences, The University of Jordan, Amman, Jordan. Fariba Moradi faribamoradi.v@gmail.com 0009-0007-2639-3745 No Department of Physical Education, Faculty of Sports Sciences, Arak University, Arak, Iran. Maryam Mazidi m.mazidi6060@gmail.com 0000-0001-7223-6299 No Department of Physical Education, Faculty of Humanities, Hormozgan University, Bandar Abbas, Iran.