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This study aimed at investigating the change of fat in each body part according to the wearing of sport underwear made of specially-processed materials. In this study, 6 females made up of three early twenties, and three later thirties took part in the exercises for 12 weeks to find out the change of fat amount in body, square of body part by CT and obesity after and before an exercise.The results are as follows:In the obesity condition after and before an exercise, Roller's index shows that in case of S1 and S4, one level was lowered concerning the basic physical strength and optimal index was not changed. In the silhouette between body frames, there are differences between ages. The body fat rate decreased 35.95% on the average, and the amount of the body fat of females in twenties was more than that in thirties. The amount of body fat decrease with the lapse of exercising time, while the amount of body fat shows increased of 0.75%, which showed the minus correlation.The rate of averaged flat by CT went up after an exercise in every body part, and also the decreased value of subcutaneous fat was not proportioned to that of weight and girth. Inbody parts, the lower abdomen was shown 49.7%, navel part 47.7% and waist part 37.3% each in numerical value. In the thickness of subcutaneous fat concerning waist, the value of front-center line was the lowest, and followed by rear-center line and lateral line. 120degree part in the navel showed the most fat layed, and the lowest fat layed was in the lateral part. Concerning the lower part of abdomen, under-skin fat was the most layed in 120degree part like that of navel part.