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Purpose: This study aimed to understand the effects of biofeedback respiratory training on lung function, respiratory muscle activity, and gait in older individuals and to explore the effectiveness of new experimental methods. Methods: Thirty older individuals aged 65 years and older with normal cognitive function who actively cooperated during training were selected from a senior citizen center in Jeollanam-do. The study participants were randomly divided into control and experimental groups with 15 participants in each group. Based on the literature and previous research, an intervention plan was developed to conduct a 6-week respiratory exercise program and biofeedback respiratory training for older individuals. Respiratory muscle activity and gait were compared between the groups after the 6-week experiment. Results: Comparing the changes in respiratory muscle activity before and after the intervention, the experimental group showed a significant increase in the activity of the sternocleidomastoid, intercostal external, and rectus abdominis muscles, compared with the control group (p<.05)(p<.001). Comparing the changes in gait before and after overload, the experimental group showed a significant increase in steps per minute, walking speed, and stride length, compared with the control group, after the intervention (p<.05) (p<.001). Conclusion: Respiratory exercise intervention combined with biofeedback breathing training can help improve lung function, respiratory muscle activity, and gait in older individuals and is expected to become a new method of daily exercise for older individuals to improve their quality of life.