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Obesity is one of the greatest factors causing health problems. Many studies have shown a significant association between obesity and lung disorders in the form of obstructive sleep apnea (OSA) and asthma. The purpose of this study is to know the ratio of lung function before and after exercise in the normal and obesity group. The research design used was quasi experimental with pretest and posttest design, using Pearson ChiSquare hypothesis test, Wilcoxon Sign Rank Test and Mann Whitney U Test. There are 60 samples divided into normal and obese with an average age of 19.47, consisting of men and women in each of 30 people. The result of this research is in the normal group average of delta value of FEV1 equal to 0,13, FVC equal to 0,10, and lung function equal to 0,87. While in the obese group the mean value of delta FEV1 is -0.17, FVC of 0.00, and lung function of -4.92. The conclusion of this study is the change of lung function between normal and obese group showed a significant difference, that is an increase in the normal group, but in the obese group actually decreased.