Brief Summary: Low back pain (LBP) is an important public health problem due to the increasing world population and aging. In chronic LBP, exercise therapy is among the first-line treatments. Core stabilization exercises (CSE), one of the motor control exercises, focus on the activation and control of the deep spinal muscles. Recently, some studies have shown that Russian electrical stimulation alone or combined with exercise can provide contraction in deep stabilizer muscles and significantly reduce pain in patients with LBP

Inclusion Criteria:

• The duration of the disease is more than 3 months with pain scores greater than four in the VAS disability score of 19% or greater as evident from the modified oswestry disability.

Exclusion Criteria:

• Neurological or musculoskeletal diseases that affect lumbar spine (e.g: lumbar spondylosis, spondylolisthesis, and lumbar disc injuries)
• women during pregnancy and lactation.
• History of lumbar spine surgery.
• Signs of lumbar radiculopathy or myelopathy.
• Signs of serious pathology (e.g., malignancy, inflammatory disorders, infection