Purpose The purpose of this study was to investigate the effects of chest expansion resistance training and breathing training on pulmonary function, trunk balance, and chest cage expansion in chronic stroke patients. Methods The subjects of this study were eighteen people in total, 9 in the experimental group and 9 in the control group. For both groups, The Bobath concept was performed for 30 minutes, 5 times a week for a total of 6 weeks, and breathing training was performed for 20 minutes, 5 times a week for a total of 6 weeks. The experimental group performed chest expansion resistance training, and the control group performed breathing training on lung function. Pulmonary function, trunk balance, and chest expansion measure were performed before and after intervention. Results As a result of this study, there was a significant increase in lung function, trunk balance, and chest expansion measure before and after intervention in the experimental group, and There were no statistically significant results in the control group. There were significant differences in lung function, trunk balance, and chest chest expansion measure between the experimental and control groups. Conclusion The results of this study showed that chest expansion resistance training was effective in lung function, trunk balance, and chest expansion in chronic stroke patients.