Diaphragmatic Doming vs Breathing Exercises on Ventilatory Function & Core Endurance in Chronic Neck Pain

Inclusion Criteria: * Patient has chronic neck pain (for more than 3 months) * Their age ranged from 20 to 30 years old * Their body mass index ranged from (18.5 -29.9) kg/m2 * Poor results on the cranio-cervical flexion (CCF) test using a pressure biofeedback instrument. Exclusion Criteria: * History of respiratory disease and Clinical signs of a severe cardiac event. * Severe psychiatric or cognitive impairment * Tumor and Spinal fractures * Spinal cord compression that required urgent surgery * Current or past Smokers * Obese (BMI \>30) or underweight (BMI ˂18.5)