Smartphone Addiction Level and Neck Muscle

Inclusion Criteria: * to be studying at Süleyman Demirel University, Faculty of Health Sciences, Department of Physiotherapy and Rehabilitation, * volunteering to participate in the study, * for the past 6 months, using a smartphone for at least 2 hours a day. Exclusion Criteria: * a history of surgical intervention or traumatic injury in the spine and upper extremity, * chronic disease affecting the musculoskeletal system such as rheumatoid arthritis, osteoarthritis and other connective soft tissue diseases, * sensory impairment in the spine or upper extremities to have a neurological and orthopedic disorder, * activities such as long-term reading, which will affect the flexion posture of the head, have been performed in the last 1 month, * having done exercises involving neck muscles in the last 1 month.