The participants will be asked to perform strengthening and stretching exercises to the back and abdominal muscles for 30 min, three times per week for 4 weeks.

The participants will receive Modified Sustained Natural Apophyseal Glide on the affected lumbar level for 30 sec three times per week for 4 weeks. In addition to strengthening and stretching exercises to the back and abdominal muscles for 30 min, three times per week for 4 weeks

Strengthening and stretching exercises to the back and abdominal muscles will be performed for 30 min, three times per week for 4 weeks.

The visual analogue scale is a 10 cm calibrated line with 0 representing no pain and 10 representing the worst pain; will be used to assess the severity of pain before and after treatment for all participants in both groups.

The modified Schober test will be used to measure the lumbar flexion range of motion (ROM) by using the tape measurement. Each participant will be asked to stand erect with her feet about shoulder-width apart to stabilize the pelvis. Then, the posterior superior iliac spines(PSIS) will be determined by the therapist's both thumbs, and then an ink line will be drawn along the midline of the lumbar spines horizontal to the PSIS to mark the midpoint between the two PSIS. Then tape will be used to identify and mark two points: one is 10 cm superior to the midpoint (A), and another is 5 cm inferior to the midpoint (B). The participant will be instructed to bend forward as much as she can while keeping both knees straight, the new distance between superior and inferior skin marking will be measured in centimeters. The increased distance along the tape due to lumbar flexion is normally about 6-7 cm (less than 5 cm should be considered abnormal).

The modified Schober test will be used to measure the lumbar extension range of motion (ROM) by using the tape measurement while the patient is in a standing position.

The participant will be instructed to put her hands on her buttocks and bend backward into full lumbar extension and the new distance between the superior and inferior skin markings will be measured in centimeters by the tape measurement. The change in the difference between the marks is used to indicate the amount of lumbar extension.

The increased distance along the tape due to the extension of the lumbar spine is normally about 2-3 cm (less than 1 cm should be considered abnormal).

Functional disability will be assessed by the Oswestry Disability Index, it was developed as a clinical valid and reliable assessment tool that would provide an estimate of disability expressed as a percentage score. It is composed of 10 questions and it takes around 5min for a patient to complete. Each of the 10 questions is scored from 0 to 5, giving a maximum score of 50. The total score is then converted into a percentage by multiplying it by 2. Scores are stratified into severity: 0-20, minimal disability; 21-40, moderate disability; 41-60, severe disability; 61-80, crippling back pain; 81-100, bed-bound. A low score = low degree of disability, a high score = high degree of disability.