## 1 Introduction  
Track and field throwing sports, including shot put, javelin, discus, and hammer throw, are Olympic sports with a rich history and global participation [1]. No matter what kind of equipment and rules, executing a throw requires the proper and synchronized functioning of the entire kinetic chain musculature, which enables the creation of a harmonized movement pattern that facilitates the transmission of force [2]. Going further into the matter, the development of athletic skills and sport-specific performance is built upon a foundation of excellent physical fitness [3], body composition and somatotype characteristics [4]. Scholars have progressively acknowledged the crucial significance of sport-specific anthropometric and physical measurement values in the realm of competency assessment [5; 6]. Due to the specialized nature of the throwing motion, its fitness characteristics is significantly different from other sports [4; 7], thus emphasizing the necessity of sport-specific characteristic studies. There have been some reports on the physiological and anthropometric characteristics of adult and elite athletes [8; 9]. However, the performance and biology of adolescent track-and-field athletes is different. For example, arms and legs strength [10] and explosiveness [11] were demonstrated to highly correlate with throwing performance, but these fitness's have a different age-growth curve [2; 12]. Combined with the differences in the rules of game for youth throwing athletes, it suggests that adolescent throwers may have different core fitness attributes compared to adult athletes. Additionally, although laboratory tests are precise in measuring physiological factors and controlling variables, it is time-consuming and expensive. Field tests, designed for specific sports, are more specific and feasible, especially for the youth [13]. Thus, using a reliable field test among different age groups could provide valid information for assessing the athletic performance of youth throwing athletes.  
On the other hand, human development exhibits gender differences, necessitating the implementation of appropriate training methods tailored to these specific variations. The clarity of sex difference helps establish achievable objectives and devise tailored training regimens. Some studies reported sex differences in growth and performance among track and field athletes [14; 15]. However, no published studies to date have investigated anthropometric and field test performance characteristics among juvenile throwing athletes. Furthermore, although achieving top-level at a young age might not a prerequisite for future achievements [16; 17], morphological and physical fitness assessments can aid in distinguishing [18] and transferring [19] young athletes into specific sports. While the development and sustained success of elite athletes is influenced by numerous complex factors, the strategy of guiding young athletes toward suitable sports based on their individual talents seems feasible in their formative years.  
A comprehension of the expected of the anticipated variations in age and gender is indispensable for coaches and practitioners. Accordingly, considering the scarcity of anthropometric and physical value research concerning juvenile throwers, the perspective of practitioners is limited. The objectives of this study were: (1) to profile the anthropometric, physical fitness, and specialized throwing strength characteristics of male and female throwers aged 14 to 18 years; (2) to identify which factors vary with age and correlate these with specific throwing strength; (3) to determine which anthropometric and physical fitness variables could explain the variance in the specific throwing performance.