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The purpose of the study was to examine changes of immune function and a form of exercise methods to induce upright growth and to change body fat effectively by carrying out walking, yoga and weight training with differentiation according to each form of exercises. The study classified 24 boy students in the 5th ~6th grade with body fat ratio of more than 25% and without physical defect with simple random sampling into walking group, yoga group and weight training group by each 8 students. The study carried out the exercises for 12 weeks. The study analyzed Immunoglobulin, Growth hormone and Adiponetin by carrying out blood analysis. The results of the study were as follows. Immunoglobulin had a significant increase after exercises at the walking group and the yoga group in the part of IgA, IgG and IgM. However, the weight training group didn’t have a significant difference. And there were no differences among each group after exercises for 12 weeks. In growth hormone and Adiponetin, the yoga group didn’t have a significant difference, but the weight training group had a significant difference. In differences among each group, the weight training group after exercises was significantly higher than the walking group and the yoga group.