Effects of Core Stabilization Exercise on Balance

Inclusion Criteria: * male or female * aged between 20-60 years * low back pain (LBP) with or without radiating leg pain for period of at least 12 weeks * answer 'yes' at least seven items of questionnaire * present positive sign of the aberrant movement sign * Present at least one positive sign from painful catch , prone instability catch test, or apprehension symptom Exclusion Criteria: * Be pregnant. * Have serious spinal pathology: spinal fracture, spinal malignancy or spinal infection * Have quada equina syndrome * Have neurological deficit (at least 2 of the following signs: weakness of lower limbs (muscle power \< grade 3 using manual muscle test), reflex changes, or abnormality or loss of sensation of lower limbs associated with the spinal nerve root * Have obvious abnormal movement of the lumbar motion segment when assessed by flexion-extension radiographs: sagittal plane translation larger than 4.5mm or 15 percent of vertebral body width according to other vertebral segment, or sagittal plane rotation larger than 15 degrees at L1-L2, L2-L3 or L3-L4, 20 degrees at L4-L5 or 25 degrees at L5-S1 * Have visual disorder, vestibular disorder, neuromuscular diseases such as polyneuropathy, or diabetes neuropathy * Participate in their intervention less than 5 out of the 10 week of intervention. * Regularly treat with core stabilization exercise (CSE), or trunk strengthen exercises.