Adolescent idiopathic scoliosis (AIS) is a three-dimensional structural deformity of the spine in which lateral flexion and axial rotation are seen in vertebrae with a Cobb (method for measuring spinal curvature) angle of 10° and above. AIS is the most common type of scoliosis and it occurs in the period from the onset of puberty (up to 10 years) until the closure of growth plates.

Children with AIS have cosmetic effects, decrease in functional capacity, muscle weakness in certain parts of the body, decrease in quality of life and posture disorders. Lack of core stability might be causing these problems.

Core stability training may have a positive effect for these problems experienced by children with AIS.

Pathologies that cause the disease may originate from the nervous system and musculoskeletal system. In this study, the investigators will evaluate these systems objectively with EMG biofeedback and Isokinetic Testing.

The aim of this study is to show the effect of core stability training on various problems (as we mentioned before) caused by the disease. In addition, the investigators of this study hope to contribute to the literature(with objective evaluations) about the pathological background and treatment of this challenging disease which the cause is unknown.

Inclusion Criteria:

• Diagnosed with AIS between the ages of 10-20
• Cobb angle is between 15-40 degrees
• The child's and family's consent to participate in the study
• The child does not receive any other treatment that will affect his scoliosis.

Exclusion Criteria:

• Surgical operation in the last 3 months
• Presence of an orthopedic, neurological, systemic disease that will prevent him from exercising
• Having mental, communicative and behavioral disorders that may cause problems understanding commands and questions or performing exercises
• Exercising 3 or more days a week.