Evaluate the effect of manual diaphragmatic release on exercise capacity, inspiratory muscles strength, symptoms severity, and health-related quality of life in women diagnosed with fibromyalgia.
Confirmed clinical diagnosis of fibromyalgia fulfilling the American College of Rheumatology diagnostic criteria.
Sedentary or low physical activity status (not participating in structured exercise programs within the past 3 months).
Severe psychiatric comorbidities (e.g., major depressive disorder with active suicidal ideation) or cognitive impairments.
Presence of comorbid rheumatologic or autoimmune conditions that overlap with muscle/joint symptoms (e.g., severe rheumatoid arthritis, systemic lupus erythematosus).
Primary chronic respiratory/chest diseases (e.g., severe COPD or active asthma).
Cardiovascular disorders or uncontrolled hypertension.