The objective of this study is to analyse the effects of diaphragmatic breathing and singing interventions on respiratory functions in women over 30 and to demonstrate their utility. The subjects were 46 women in their 20s from S University in C City, Chungnam, who had not yet exhibited the typical respiratory decline associated with age. A total of 12 subjects were randomly selected from this group and assigned to the control group. The experimental group comprised nine women over the age of 30, with the exception of three individuals who did not meet the established criteria for participation. All participants underwent five types of respiratory function tests using a diagnostic with the objective of assessing, assessing expiratory vital capacity, expiratory reserve volume, inspiratory reserve volume, minute ventilation, and tidal volume. The experimental group participated in a 12-session program, or comprising diaphragmatic breathing and singing for 60 minutes three times a week over four weeks. Comparing the results of respiratory function tests in the experimental group before and after the intervention, expiratory vital capacity increased by 4.5% from 2.87L to 3.00L, expiratory reserve increased by 27.5% from 0.91L to 1.16L, and minute ventilation increased by 16.7% from 7.00L/min to 8.17L/min. Consequently, this study confirms the effectiveness of diaphragmatic breathing and singing in enhancing respiratory functions and their utility in improving respiratory health. Future research could expand these findings by incorporating dance movements into an integrated approach for respiratory function improvement and psychotherapy.