## 4 Discussion  
This study was the first to identify the characteristics and differences in anthropometric, physical fitness and specific throwing strength aspects between sexes for adolescent throwers aged 14-18. Series tests, including 11 anthropometric and physical fitness tests and specific throwing tests, were conducted on 258 youth throwers. The main findings included differences in anthropometric and physical performance aspects as chronological age changes, along with the varying degrees of correlation between different indicators and specific throwing strength. Adolescents generally begin to experience their peak height velocity (PHV) around the age of 13, with girls potentially starting it a bit earlier [48]. Our research found that there are differences in anthropometric measurements among boys aged 14 to 18, while no differences were observed among girls. The anthropometric characteristics of adolescent throwers align with previous findings; throwing athletes tend to be taller and heavier [4]. Taller and heavier athletes may have a potential advantage because they may have greater muscle mass [49] and release height [43]. Boys continue to experience rapid development between the ages of 14 to 18, while earlier growth in girls makes the differences during this period less pronounced. Additionally, we also found a significant correlation between height, weight, and the specific throwing strength. [PERSON] et al. analyzed junior Olympic athletes and similarly discovered their unique anthropometric characteristics [4]. For physical fitness performance, among boys of different ages, significant differences were found in the hexagon agility test, standing long jump, standing triple jump and FOMB. These results are in line with previous findings, which found an increase of agility [50], muscle strength and power [51] performance with maturation for boys. Our research findings suggest that male throwing athletes aged 14-18 experience a higher growth rate in agility and lower limb power. Similarly, among girls of different ages, significant differences were observed in the hexagon agility test and plank test. This indicates that after the PHV, agility still exhibits considerable growth with advancing age. Furthermore, boys and girls of the same age show significant differences in speed, agility and explosive power, and even if there is no difference at 14-16 years old, there is a gradual difference at 17-18 years old. However, the differences in FOMB and BOST and specific throwing strength diminish with increasing age. This trend could potentially be attributed to variations in the weight of the equipment used. These findings reveal that growth and development during adolescence may influence these variables differently. It enables coaches and athletes to consider the distinct progression rates in key indicator developments across different stages, thereby designing tailored training programs that adapt to these changes. Notably, specific throwing strength demonstrated significant correlations with FOMB and BOST, although they use different force generation patterns. [PERSON] et al. [35] confirmed the effectiveness of the medicine ball throw in assessing the explosive power for an analogous total-body movement pattern in sand volleyball players. In our study, FOMB showed a significant correlation with shot put, javelin throw, and discus throw, and BOST exhibited a significant correlation with shot put, javelin throw, and discus throw. In addition, BOST is present in the regression equations for shot put, javelin, and discus. The assessment of specific strength using FOMB and BOST is suggested as viable field test components for track-and-field throwing athletes. Furthermore, we found lower body power, linear sprint speed, upper back strength and aerobic ability correlated with specific throwing strength in shot put, javelin throw, and discus throw events. Undoubtedly, speed, power [52], agility and coordination are linked to the performance in throwing [53]. [PERSON] et al.