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Non-specific chronic back pain (NCLBP) is a prevalent disorder, generating large health and social costs, usually accompanied by the painful limitation of movement and often influenced by physical activities and posture.1,2 Low back pain (LBP) is the reason for seeking care in nearly 50% of all patients presenting to outpatient physical therapy clinics.3,4 Approximately 23% of cases develop into CLBP.5 Clinicians agree that LBP is heterogeneous.6 Using classification schemes in the treatment of patients based on subgrouping results in better outcomes than treatment based on clinical guidelines.7,8 Movement system impairment (MSI) based classification by Sahrmann is a system for directing physical therapy in patients with NCLBP at any stage of chronicity.9,10 The clinician categorizes a patient with LBP into 1 of 5 different syndromes based mainly on pain behavior during specific Comparison of Trunk Muscle Endurance between Lumbar Rotation with Flexion Syndrome and Rotation with Extension Syndrome