## 4 Discussion
Conversely, the Isostretching group showed slight advantages in explosive strength, potentially due to the emphasis on isometric control and muscle activation, which can be beneficial for short-duration, high-intensity movements [28]. This supports the notion that myofasical stretching can play a crucial role in restoring movement patterns and reducing compensatory mechanisms. Similarly, findings by [PERSON] et al. (2019) suggest that structured flexibility training can enhance movement economy and reduce injury risk, which aligns with our observed outcomes [29]. This study represents a novel approach as it is the first to examine the effects of the Mezieres and Isostretching methods on athletic performance, specifically in the context of CMJ in rhythmic gymnasts with LBP. Previous research has investigated the influence of various training methods on vertical jump performance, including posterior chain and core strengthening programs [30], isokinetic training [31], kettlebell-based interventions [32], and alternative neuromuscular re-education strategies such as virtual reality training [31]. While these studies reported improvements in jump height, power, or neuromuscular efficiency, none have specifically targeted global postural therapy techniques like Mezieres and Isostretching, which are designed to enhance muscular balance, reduce postural asymmetries, and promote long-term biomechanical efficiency. Our findings suggest that postural training may serve as a possible strategy not only for injury prevention and rehabilitation but also for performance optimization in rhythmic gymnasts, complementing existing strength and conditioning methodologies. Based on previous research on postural therapy, this study extends current knowledge by demonstrating that Mezieres and Isostretching techniques can influence not only postural alignment and pain management but also explosive movement performance, specifically CMJ outcomes in rhythmic gymnasts with LBP. While prior studies have highlighted the benefits of Mezieres and Isostretching for flexibility improvements, postural stability, and neuromuscular coordination [3,4,6], these investigations primarily focused on rehabilitation markers rather than performance-based outcomes. Moreover, Isostretching has been reported to enhance core endurance and spinal alignment, which are key factors in optimizing motor control and injury prevention [5]. However, none of these studies have explored how postural therapies may directly contribute to power production, force efficiency, and movement execution in sports requiring explosive capabilities. Previous research has examined the role of global postural re-education (GPR) and other corrective strategies in musculoskeletal rehabilitation [7], but their potential implications for high-intensity athletic performance remain largely unexplored. By integrating postural therapies with jump performance assessments, this study provides novel insights that bridge the gap between rehabilitation-based postural training and sports performance optimization, contributing to a more comprehensive understanding of postural interventions in elite gymnastics training. Future research should further explore the long-term impact of postural correction techniques on explosive performance and their potential integration into athletic training programs, helping to refine evidence-based approaches for performance enhancement and injury prevention. Reflecting on this trial's participants, an age range of 10 to 30 years can be considered for elite rhythmic gymnasts with low back pain (LBP) due to early specialization, peak performance demands, and physiological factors. Rhythmic gymnasts begin intensive training as early as 8-10 years old, predisposing them to overuse injuries, including LBP [33]. Elite gymnasts often compete at high levels into their late 20s or early 30s, with sustained training loads contributing to persistent LBP [34; 35].