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The objective of this study is to clarify relationship between male middle school students' basic physical ability and their fat rate in their body. The test for the students' physical ability consists of 50M sprint, arm-bending, sit-up, standing long jump, trunk flextion sitting down and long race. The measured parts in their body are the abdomen, arm, thigh, and calf. For the result analysis, the simple regression analysis is used. Therefore, the result of this study suggests the following conclusions.1. 50M sprint shows a meaningful relationship with the weights excluding the total fat rate and the weights including the total fat rate.2. Arm-bending doesn't have a meaningful relationship with the weights excluding the total fat rate and the weights including the total fat rate.3. Sit-up doesn't have a meaningful relationship with the weights excluding the total fat rate and the weights including the total fat rate.4. Standing long jump doesn't have a meaningful relationship with the weights excluding the total fat rate and the weights including the total fat rate.5. Trunk flextion sitting down doesn't have a meaningful relationship with the weights excluding the total fat rate and the weights including the total fat rate.6. Long race shows a meaningful relationship with the weights excluding the total fat rate and the weights including the total fat rate.1) 2) 한국외국어대학교130-791 서울 동대문구 이문동 270번지1. 2. Hankuk University of foreign studies270 Imun-dong Dongdaemun-gu Seoul Korea3) 한국폴리텍 I 성남대학467-711 경기도 성남시 수정구 산성동 4번지 3. Korea Polytechnic I Sung Nam College4 Sansung-dong sujung-gu Sungnam Korea