Objective: It is known that mutual support, guidance from experts and colleagues, and the use of new technologies are effective in group counseling intervention to promote physical activity. But it has never been studied in Korea, group counseling effect was examined by applying daily exercise skill to adults who work and study at the same semester. Methods : Postgraduate students were diveded into intervention and control group. For data analysis, frequency analysis, Mann-Whitney U test, Wilcoxon Signed-Rank test, and Fisher’s exact test were conducted, and behavioral changes and psychological antecedents were identified by applying repetitive comparative analysis. Results: Commitment score became significantly higher after intervention in intervention group. No other significant changes were observed in Decisional Balance and Self efficacy after intervention. Conclusion: Group counseling intervention to promote physical activity showed only small increase of Commitment in post-graduate students. Further mixed research methods on changes in physical activity motivational preparation may helpful to know more detail information.