The aim of this study is to investigate the effects of expiratory muscle strength training in addition to pelvic floor muscle training in women with stress urinary incontinence. In this study, women will be randomly assigned to one of two separate intervention groups. One group is the Pelvic Floor Muscle Training (PFMT) group, and the other is the PFMT plus Expiratory Muscle Strength Training group. The intervention program will last 8 weeks in both groups. Women in both groups will be evaluated at the beginning of the study (before the interventions) and at the end of the 8th week of intervention. After being taught the exercises included in the PFMT program, both groups will be asked to perform these exercises as a home program. The accuracy of the exercises performed by the women will be checked at two-week intervals, and the number of exercises will be increased. The primary outcome measure is the International Incontinence Consultation Questionnaire-Short Form (ICIQ-UI SF), which measures the Subjective Severity of Incontinence and its Impact on Daily Living.