Reliability of Posterior Shoulder Endurance Test in Overhead Athletes

Inclusion Criteria: For all athletes: * Being between the ages of 13-24, * Participating to overhead sports (tennis, volleyball, handball, etc.), * Training at least 2-3 hours a week, * Active participation in training and competitions, * To be able to complete all assessments in the study, For athletes with shoulder pain: * Shoulder pain is 3/10 or more in the Visual Analogue Scale. For Athletes without shoulder pain: * No shoulder pain (0/10 according to Visual Analog Scale) * No history of a shoulder injury and/or shoulder symptoms requiring treatment for the past 1 year. * Having 90/100 or higher results in Kerlan-Jobe Orthopedic Clinical Shoulder \& Elbow Score Exclusion Criteria: * Bilateral shoulder pain, * Upper extremity fracture history, * Surgical history of shoulder, cervical and thoracic region, * Diagnosis of musculoskeletal disease in the cervical region, elbow, and wrist, * Neck and shoulder pain with active/passive cervical spine movement, * Frozen shoulder, * Multidirectional joint hypermobility, * Having a systemic musculoskeletal disease, * Diagnosis of chest deformity and scoliosis.