The purpose of this study was to evaluate the relationships of exercise habits and parents' body type to body composition in 192 males aged 15-20 years. The subjects were classified into the athlete group who belong to athlete clubs (n=103) and the non-athlete group without exercise habits (n=89), and the physique (BMI, W/H ratio), skinfold thickness, and percent (%) body fat (air displacement method) were compared between the two groups, and the parents related to the subjects by blood were also investigated. BMI did not significantly differ between the athlete and non-athlete groups, but % body fat was significantly lower in the athlete group. In all subjects, the BMI in the mother was significantly related to that in the subject. However, in the athlete group, no association was observed. In adults, lack of exercise is reflected by % body fat and BMI. However, in the youth in the latter period, lack of exercise may be reflected only by % body fat and not by BMI. The physique and physical composition may be inherited from the mother, but the inherited constitution may be modified by exercise habits.
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