Effect Of Mckenzie Exercises On Postural Stability In Mechanical Back Pain Patients With Prolonged Sitting Posture

Inclusion Criteria: * • patients with mechanical Low back pain aged 18 - 35 years. * patients who spend at least 6 hours daily sitting (in office, at home, or screen time). * patients who feel some sort of discomfort and pain after prolonged sitting. * Patients with flat lumbar curves. * patients have not received any physical therapy or medications in the last six months. * Subjects with normal body mass index (BMI) from 18.5-24.9 kg/m2 Exclusion Criteria: * • patients with known neurological disorders or balance disorders. * patients who engage in regular physical activity exceeding 150 minutes per week (as this could influence balance). * patients who do not sit for prolonged periods of time habitually. * Major structural spinal deformities (scoliosis or stenosis) inflammatory diseases * Sequestered hernias. * History of spinal surgery. * Lower limb and pelvis deformities e.g. Leg length discrepancy * patients have Severe medical or psychiatric disorders