The Effects of Progressive Core Stabilization Exercise Training

Inclusion Criteria: * female volleyball player aged between 12-14 years * being trained by the same trainer Exclusion Criteria: * having had a lower or upper extremity injury lasting less than 3 months * having had a back-related operation * being diagnosed with spondylosis-spondylolisthesis * having acute low back pain * lack of family permission or * not being willingness.