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The purpose of this research is to find out the effects of four weeks of the aerobic exercises concentrated on the abdomen and of four weeks of rest just after the four-week exercises upon the body composition, blood pressure, heart rate and blood plasma and the abdomen fat area of obese middle school male students in order to develope the effective program of curing obesity of obese students. The results show as follows: 1. The rate of body fat has been reduced significantly low after the four weeks of rest, compared to the period before the exercises. As for the abdomen fat area, all of subcutaneous fat area, visceral fat area and total fat area has been reduced much lower after both the four weeks of the exercises and the four weeks of rest, compared to the period before the exercises. 2. HDL-C has shown the phenomenon of increasing as the periods went, compared to the period before the exercises. But it hasn't shown any significant differences. LDL-C has been reduced significantly low after the four weeks of the exercises, compared to the period before the exercises. TC has been reduced significant low after both the four weeks of the exercises and the four weeks of rest, compared to the period before the exercises. TG has shown the tendency to decrease continuously but hasn't made any significant differences. Glucose has decreased slowly as the periods went, and has shown the significant reduction after the four weeks of the exercises and the four weeks of rest, compared to the period before the exercises. 3. Heart rate has shown the significant differences between the period before the exercise and the period just after the four weeks of the exercises, and between the period just after the four weeks of exercise and the period, of the four weeks of rest. Diastolic blood pressure has shown the significant differences before the exercises and after the four weeks of rest. Systolic blood pressure has shown the tendency to decrease according to the periods, but hasn't shown any significant differences.