Upper Extremity Exercise Capacity in Chronic Non-specific Neck Pain

Inclusion Criteria: For the patient group: * Being between 18 and 65 years of age * Having a chronic non-specific neck pain (pain lasting longer than 3 months, located in the region between the occiput, the first thoracic vertebrae, and the acromion) * Being willing to participate in the study For the healthy group: * Being between 18 and 65 years of age * Being willing to participate in the study Exclusion Criteria: For both groups: * Presence of psychological disorders, mental health conditions, cancer, or severe depression * History of traumatic injury * History of primary or metastatic spinal malignancy, or spinal fracture * Presence of a neurological disorder (e.g., hemiplegia, multiple sclerosis, Parkinson's disease, etc.) * Diagnosis of advanced osteoporosis * History of surgical intervention in the cervical region or presence of an acute infection * History of surgery involving the upper extremity or an injury/disability within the last 6 months * Thoracic outlet syndrome