This study examined the relationship between physique, physical fitness, physical activity status, exercise habits, and serum lipid concentration of 265 Korean male students who lived in Seoul. The subjects were classified into the exercise group (EG：n = 199) and the non-exercise group (NEG : n = 66). The latter group did not perform moderate-intensity exercise. Body composition, physical fitness tests, and serum concentrations of lipids（high-density lipoprotein cholesterol : HDL-C, triglyceride : TG, and total cholesterol : TC) were measured. The daily life style, including TV viewing, PC use, study time, was assessed by an original questionnaire. The physical fitness in EG was superior to that in NEG. Serum HDL-C concentration in EG was significantly higher than that in NEG. Furthermore, serum TG concentration and body fat percentage in EG were markedly lower than those in NEG. EG had significantly higher frequencies of exercise and study per week than NEG. In NEG, the most common reason of non-exercise habit was “I don’t want to move my body,” and the secondary reason was “I don’t have the time.” In conclusion, male students who exercise regularly have high physical fitness levels and a lower percentage of body fat and TG. In addition, it is suggested that the exercise group should not only continue to maintain their exercise time but should also increase their time devoted to studying.
