Study aim: Investigating the efficacy of Core Stability Exercise therapy and Feldenkaris Method in Patients with CNSLBP Design: This study was designed as a double-blind randomized controlled trial. 60 patients with diagnosis of CLBP for at least 3 months were randomly allocated to the (FG) or (CSEG) (mean age 38.8 years). Pain was assessed using the McGill Pain Questionnaire (MPQ), disability was evaluated with the Oswestry Disability Index (ODI), quality of life was measured with the WHOQOL-BREF, and mind–body interactions were studied by the Multidimensional Assessment of Interoceptive Awareness Questionnaire (MAIA). Abdominal transverse muscle (TrA) diameter at rest and draw-in maneuver were assessed by ultrasonography before and after the intervention. Data were collected at baseline, at the end of treatment. Settings and conduct: The study was performed at the sport medicine center of MAZUMS. The study was a double-blind, parallel, randomized clinical trial. Both participants and evaluators were unaware of the allocation of study groups. Participants/Inclusion and exclusion criteria: Inclusion criteria: • History of low back pain: at least for three months • Clinical Diagnosis of nonspecific low back pain: • Pain severity in pain assessment questionnaire: between 3 and 6 out of 10 • Patients of 18 to 60 years old Exclusion criteria: Patients under 18 or above 68 yrs Diagnosis of acute or specific low back pain Intervention groups: The study constituted of two interventing exercise therapy, the gropus of core stability exercise and and Feldenkaris, performed on patients with chronic non-specific low back pain. Main outcome variables: This study investigates the impacts of the two types of exercise therapy on pain, disability, body awareness, quality of life, and transverse abdominal muscle diameter in patients with CNSLBP.