the purpose of this trial is to investigate and compare between lumbopelvic stabilization and pilates exercises on gait cycle phases and maximum peak pressure on the foot in chronic nonspecific low back pain?

LBP is the leading cause of activity limitation, results in significant losses in productivity at work, and incurs billions of dollars in medical expenditure annually So, the aim of physical therapy treatment in the patient with chronic nonspecific low back pain is more effective in improving gait cycle phases and maximum peak pressure on the foot and help LBP patients to walk normally as much as possible, also this will improve our body of knowledge about the best modalities for treating LBP. The finding of this study may help LBP patients avoid exposure to complications due to altered gait cycle phases and maximum peak pressure on the foot. Also, it will help physiotherapists to know which treatment will be effective in improving gait cycle phases and maximum peak pressure on the foot. one hundred patients with mechanical low back pain will be allocated randomly to three groups; group A will receive pilates, group B will receive lumbopelvic stabilization exercise and group C will receive strengthening exercises for the abdominals, back, and hip muscles

Inclusion Criteria:

1. Their age between 20 and 40 years
2. patients is required to have chronic nonspecific LBP (more than12 weeks), defined as Pain in the lumbar and/or buttock region (defined as pain reported below the level of T12 and no lower than the buttock line).
3. Patients will be excluded if they have signs of serious spinal pathology (red flags) including significant trauma, unexplained weight loss, and widespread neurologic changes

Exclusion Criteria:

1. subjects with specific back pain (fracture, osteoporosis or degenerative changes, prolapse intervertebral disc, bone disorders, arthritis, tumour),
2. subjects with neurological involvement (radiculopathy, myelopathy),
3. subjects with previous spinal surgery

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