Thoracic Expansion vs DNS Exercises in Forward Head Posture

Inclusion Criteria: * Adults aged 18 to 40 years. * Craniovertebral angle (CVA \< 53°) indicating forward head posture. * Able to perform exercise-based interventions. * Voluntarily agrees to participate and signs the informed consent form. * No neurological, orthopedic, systemic, or cardiopulmonary conditions that would limit participation. Exclusion Criteria: * Contraindications to exercise (e.g., acute musculoskeletal injury, uncontrolled cardiovascular disease). * Chronic upper respiratory tract disease that may affect spirometry results. Presence of a cardiac pacemaker. * Neurological disorders, systemic diseases, or mental impairments that could interfere with exercise cooperation. * History of orthopedic or musculoskeletal surgery affecting mobility or posture. * Currently participating in respiratory exercises, spinal stabilization training, or structured exercise programs. * Engagement in professional sports or intensive physical training that may affect baseline neuromuscular measurements. * Failure to comply with the exercise program (e.g., missing 3 consecutive days of prescribed exercises).