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The purpose of this study was to determine the effects of Circuit Weight Training (CWT) on body composition and serum lipids in obese high school girls. The subjects were 11 obese highschool girls(BMI 27㎏/㎡). They were to perform the Circuit Weight Training with 40∼55% intensity of 1RM, for 50 mins/day, 3 times/week during 12 weeks. Before and after training, 10 ㎖ blood was extracted from the antecubital vein of each subject for the purpose of analyzing its effects on serum lipids. The conclusion of this study is as follows : 1. In body composition and anthropometry profile after 12-week Circuit Weight Training was decreased significantly in %fat, BMI, body weight but LBM had no statistical signification. 2. 1. In serum lipid profile after 12-week Circuit Weight Training was increased significantly in TC, HDL­C and decreased significantly in PL but LDL­C had no statistical signification.