## 1 Introduction  
Anthropometry is a vital tool for identifying differences in body dimensions and compositions among various population groups, providing critical insights into physical health and performance [1]. The World Health Organization (WHO) recognizes anthropometry as an inexpensive, non-invasive method to monitor health, and it is widely used in both clinical and research settings [2]. Everyone possesses unique morphological characteristics,influenced by genetics, age, sex, and lifestyle, that define their anatomical and functional traits [3].  
The International Society for the Advancement of Kinnathropometry (ISAK) offers a standardized methodology for the collection and interpretation of anthropometric data, ensuring reliable measurements across different populations [4]. Using a specific research methodology is crucial because it provides guidelines for investigators to define their questions and objectives, making it possible to correlate their results and draw conclusions. This approach enables a detailed understanding of how body structure impacts physical performance and health outcomes. In this study, we assessed the kinanthropometric differences among amateur athletes grouped by biological sex and their recreational sport of choice, as defined by [PERSON]'s criteria [5]. That is, we classified an amateur athlete as someone who engaged in at least 150 min of moderate-intensity aerobic activity or 90 min of high-intensity activity per week.  
Physical activity has been well-established as a cornerstone of public health, offering numerous benefits that extend beyond physical fitness. Sedentary lifestyles are strongly associated with negative health outcomes including cardiovascular disease, diabetes, and mental health disorders [6; 7]. Regular exercise has been shown to significantly reduce the risk of more than 25 chronic conditions including hypertension, type 2 diabetes, and certain cancers and lower the risk of premature mortality by 20-30% [8; 9; 10]. These findings highlight the importance of physical activity in both the prevention and management of chronic diseases [11].  
The application of anthropometry in sports science provides valuable insights into how body composition can influence performance and susceptibility to injury [12]. Kinanthropometric data are crucial for understanding the physical demands of various sports and how different body types are better suited for specific activities [13; 14]. This is particularly relevant for amateur athletes, as tailored training programs based on individual body metrics may help optimize performance and reduce the risk of injury [15].  
Furthermore, sex-based differences in body composition, such as muscle mass, fat distribution, and bone density, play a significant role in health and performance outcomes [16]. Men typically exhibit greater muscle mass and strength, while women tend to have higher body fat percentages and distinct patterns of fat distribution, which are important considerations in both sport and health contexts [17]. Understanding these differences can help develop more targeted interventions that promote optimal health and performance for both sexes.  
Given the broad implications of physical activity for public health and the potential of anthropometric data to guide personalized exercise and health recommendations, it is crucial to continue research in this field. By analyzing kinanthropometric differences among recreational athletes, we can better understand how body composition influences sport participation and long-term health outcomes. This knowledge could also aid in the development of interventions aimed at promoting healthy living and reducing the risk of various pathologies [18]. Therefore, we decided to analyze the anthropometric differences between the sexes and among different sport modalities in a heterogeneous population, as we believe that these insights could be used as a reference for many health and sport professionals.