Low back pain is one of the most common musculoskeletal disorders, significantly affecting the quality of life of individuals. In non-specific low back pain, a lack of stabilization in the core region negatively impacts the performance of activities. The diaphragm forms the framework of the core region, and its dysfunction can contribute to both respiratory problems and low back pain. This study will investigate the effects of diaphragm relaxation, added to spinal stabilization exercises, on pain, disability, quality of life, central sensitization, and trunk muscle endurance.