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This study aims to determine the characteristics of somatotype and body composition of swimmers from Flam Aquatics Club in Kediri City. A quantitative descriptive approach was used with a cross-sectional study design. The sample consisted of 10 swimmers aged 9–17 years, selected through purposive sampling. Somatotype was measured using the Heath-Carter method, while body composition was assessed using a Bioelectrical Impedance Analysis (BIA) scale. Data analysis was performed using Microsoft Excel 2012. The results showed that male swimmers were predominantly of the Central somatotype (4 athletes), while female swimmers were evenly distributed between Endomorphic Ectomorph and Ectomorphic Endomorph types (2 athletes each). The average body composition of male swimmers included muscle mass of 34.48 kg, bone mass of 1.88 kg, fat mass of 5.07 kg, and body fat percentage of 10.65%. For female swimmers, the average muscle mass was 27.7 kg, bone mass 1.5 kg, fat mass 5.25 kg, and body fat percentage 15.08%. It can be concluded that male athletes tend to have a Central somatotype, while female athletes are equally divided between two somatotype categories. The highest bone and fat mass in female athletes was found in those with the Ectomorphic Endomorph type.

Body composition refers to the distribution of fat, muscle, bone, and other tissues in the human body, which is often expressed as a percentage of total body weight consisting of fat mass and lean body mass. Obesity, characterized by excess fat in adipose tissue, poses a significant health risk and is increasing in countries with low and medium mortality rates, especially in metropolitan areas. Factors contributing to this include genetics, a lack of physical activity, socioeconomic status, unhealthy eating patterns, psychosocial factors, smoking, and alcohol consumption. Excess body fat significantly contributes to morbidity and mortality. Although optimal body fat levels vary, excess fat increases the risk of health issues such as joint problems and cardiovascular disease. People widely use bioimpedance analysis (BIA), an efficient, non-invasive method, to assess nutritional status and body composition. This activity uses the PDCA (Plan-Do-Check-Action) method, which is carried out at PT. Narindo, North Jakarta, in the productive age population. The examination results showed that the average levels of total body fat, visceral fat, total subcutaneous fat, total muscle mass were 28.6%; 11%; 22.2%; 28.3%. Early detection of body composition is critical for assessing nutritional and health status as well as diagnosing disease, potentially reducing obesity-related morbidity and mortality.