## 4 Discussion
This is particularly valuable in talent development systems, where continuous, accessible monitoring is essential for load management and performance progression. Although several prior studies have validated the MyJump applications, the present study advances the field by including a broader and more diverse youth sample spanning five competitive age groups (U14-U19). This age range allows for a more comprehensive examination of the tool's applicability across different stages of athletic development, which has been underrepresented in earlier research. Additionally, the simultaneous assessment of both countermovement jump (CMJ) and squat jump (SJ) performance further distinguishes this study, as previous investigations often focused on a single jump type. Together, these elements enhance the ecological validity of the findings and provide more generalizable evidence supporting the practical use of MyJump 2 in youth sport contexts. Despite the encouraging findings, several limitations warrant consideration. First, although Chronojump is a widely validated system, it is not the ultimate gold standard (i.e., force plate). Future research could replicate this design using force plates as a reference to further confirm the generalizability of these findings. Second, the study was conducted in a controlled indoor laboratory environment, which may not fully reflect the conditions encountered in field-based sports settings. Future investigations should also aim to replicate these results under more ecologically valid circumstances and assess inter-rater reliability among different evaluators to further establish the robustness of the application. Furthermore, one methodological limitation of the present study is the absence of inter-rater reliability assessment. While intra-rater reliability was examined using repeated measurements by the same evaluator, the robustness of the MyJump 2 application, when used by different evaluators, remains unexplored in the present study. This limits the generalizability of the findings to situations involving multiple testers with varying levels of experience. Future research should consider including inter-rater comparisons to further establish the consistency of the application across users. Lastly, the findings of this study confirm that MyJump 2 is a valid, reliable and practical tool for assessing CMJ and SJ performance in youth soccer players across developmental stages. MyJump 2 offers significant potential for use in applied sport and educational settings due to its portability, affordability and ease of use. Strength and conditioning coaches can employ the app for routine monitoring of explosive performance during training cycles, facilitating timely adjustments to individualized programs. Physical educators and youth development coaches can implement the application as part of performance profiling or to track maturation-related changes in motor performance and serve as a valuable screening and monitoring instrument. Its strong agreement with Chronojump, high test-retest reliability and minimal measurement error support its integration into sport science and coaching practices as a cost-effective solution for longitudinal monitoring of neuromuscular performance. Future research could further extend the current findings by assessing the performance of the MyJump application in female athletes and across various sports, validating its accuracy against gold-standard force platforms rather than only electronic contact mats in larger and more diverse populations, examining long-term test-retest reliability and day-to-day variability under field conditions and exploring its potential utility for monitoring inter-limb asymmetries and fatigue in youth athletic settings.