The aim of this randomized controlled trial is to investigate the acute effects of fascia correction Kinesio Taping applied to the thoracolumbar fascia (TLF) in individuals with Subacromial Impingement Syndrome (SIS). Participants will be randomly allocated into an intervention group and a sham taping control group. The intervention group will receive fascia correction Kinesio Taping applied to the thoracolumbar region, while the control group will receive sham taping without therapeutic effect. Clinical parameters including pain intensity, trunk range of motion, thoracolumbar fascia flexibility, lumbar mobility, and posterior shoulder capsule tightness will be assessed before the intervention and 45 minutes after the application. This study aims to provide evidence regarding the acute clinical effects of thoracolumbar fascia modulation in individuals with Subacromial Impingement Syndrome.