## 1 Introduction  
As humans age, various parts of the body naturally grow and mature. Athletes, from a young age, select a specific sport and develop physically in conjunction with that sport. During their growth phase, it is expected that athletes' bodies will respond to the continuous stimuli of the chosen sport, growing in a way that maximizes athletic performance. In addition to various physiological mediators that influence athletic performance and outcomes, anthropometric variables such as body fat and lean mass [1], arm circumference [2], and skinfold thickness [3, 4] are also known to be related to athletic performance. The length of the femur and tibia, especially in the lower body, is closely related to human mobility and stride length, making it an important factor in sports that require movement on the ground [5]. Recent studies have reported a positive correlation between the absolute and relative total lengths of the upper leg (femur) and lower leg (tibia) with running performance [6]. This suggests that longer legs require less energy to accelerate leg movements, allowing endurance runners to move more efficiently and economically [7; 8; 9]. Leg length is an important morphological factor that influences stride length [5; 10], and as leg length increases, stride length also increases, potentially enhancing sprint performance [11]. Additionally, [PERSON] et al. [12] found significant differences in lower body power between volleyball players with longer and shorter leg lengths, indicating that a longer lower body length is associated with greater lower body power. However, according to the data analysis of [PERSON] et al. [13], a negative correlation of \(-0.369\) was found between leg length and leg explosive power, suggesting that shorter legs may be more capable of generating explosive power. The conflicting results of these studies, which were conducted on athletes, indicate that controversy over the conclusions still remains. Traditionally, body measurements using tape measures have been employed to assess leg length, but this method has faced issues with ambiguity (low reliability) and technical limitations. Recently, advancements in equipment have introduced alternative methods such as leg length measurement using Dual Energy X-ray Absorptiometry (DEXA) [14] or the use of Magnetic Resonance Imaging (MRI) to measure the length of the femur or tibia and evaluate their relationship with physical performance [15]. However, while DEXA and MRI provide high accuracy and reliability, the high cost of these methods makes them less practical for use in sports and health sciences, where timely data are crucial. Therefore, it is suggested that using specialized body measurement equipment, such as the Martin Anthropometer operated by a trained expert, may offer a more cost-effective and efficient solution for practical applications in the field. Based on the results of previous studies, it is evident that leg length (thigh, lower leg) is strongly correlated with endurance capacity, sprinting ability, lower body power, and jumping ability [8; 12; 15; 16]. However, prior studies have primarily focused on runners or athletes from a single sport, and most have looked at the total leg length rather than segment-specific measurements. There is a noticeable gap in the research that considers the diversity of sports and the specific characteristics of each different sport, as well as studies exploring the relationship between agility and other physical elements. It is likely that there is an advantageous leg length depending on the nature of each sport, and a deeper understanding of the interaction between leg length and physical performance in athletes across various levels is needed. This study was conducted with the hypothesis that leg length could have an impact on agility, speed, and muscular power. The results of this study could play a crucial role in identifying potential athletes across various sports, guiding sport selection, and developing effective training programs tailored to specific sports.