The subject lies in the supine position; the therapist stands at the patient's head, facing the subject. The therapist then, places the thenar eminence of each hand to the pectoral region inferior to the clavicle and the other fingers are spread around the thoracic cage and angled toward the body's side to create a consistent, compressive force across the thoracic cage. The subject is then asked to breathe in deeply and breathe out. While breathing out, rhythmic oscillatory compression in the posterior and caudal direction is applied to the chest wall. By the end of the expiratory phase, the compressive force is maintained, and the subject is asked to take another deep breath. In this way, the subject encountered some resistance equivalent to the chest-wall movement during inspiration. The maneuver is repeated for five respiratory cycles, after that the therapist slowly reduces the compressive force and withdraws his hands.

Stretching exercises (hamstring stretch-lower back stretch) Strenghening exercises(abdominal curl up-supine bridging-trunk extension)

The subject lies in the supine position; the therapist stands at the patient's head, facing the subject. The therapist then, places the thenar eminence of each hand to the pectoral region inferior to the clavicle and the other fingers are spread around the thoracic cage and angled toward the body's side to create a consistent, compressive force across the thoracic cage. The subject is then asked to breathe in deeply and breathe out. While breathing out, rhythmic oscillatory compression in the posterior and caudal direction is applied to the chest wall. By the end of the expiratory phase, the compressive force is maintained, and the subject is asked to take another deep breath. In this way, the subject encountered some resistance equivalent to the chest-wall movement during inspiration. The maneuver is repeated for five respiratory cycles, after that the therapist slowly reduces the compressive force and withdraws his hands.

Arabic version of the Visual analogue scale (VAS) will be used, the subject will mark on a 0-10 graphic rating scale in which the (0) value indicating no pain, and (10) indicating the most severe pain experienced. Then a ruler will be used to measure the distance from zero, the recorded number will be rounded to the closest value

Functional disability level will be assessed by Oswestary disability index (ODI) which is a clinical assessment tool that provides an estimate of disability expressed as a percentage score. It consists of ten sections that assess pain, personal care, lifting, walking, sitting, standing, sleeping, sexual life, social life and travelling. It consists of ten multiple choice questions for back pain; patient selects one sentence out of six of the best describes her/his pain. High scores indicate great pain (Nishant et al., 2014). Arabic version of the questionnaire will be used and the questions are going to be explained to the subjects. For illiterate subjects, the therapist will read and explain the questions for them

Modified-Modified Schober test (MMST) which is a valid and reliable tool, is used to assess lumbar spine mobility through flexion, extension movements