Therapeutic Effects of Instrument-assisted Versus Sound-assisted Soft Tissue Mobilization in Chronic Non-specific Low Back Pain

Inclusion Criteria: * Pain between the inferior gluteal folds and the costal margins. * Pain with a duration of a minimum of 24 weeks. * Moderate to severe pain (\>3) was measured using the Numeric Pain Rating Scale. * Straight Leg raise Limited (hamstring tightness) Exclusion Criteria: * Pain in lower back with radiating/referring but limited to proximal legs * Pain for the last 03 months and at least half of the days in the last six months. * Presence of neurological problem/deficit/disease (e.g., nerve root compression, motor deficit, paresthesia) and lower limb symptoms. * Presence of disease like Infection, tumors, spondylolisthesis grade II or higher, vertebral fractures, identifiable cause like endometriosis * Medicine like immunosuppression or steroid medication; * Spinal deformities * History of severe rheumatic, orthopedic, or cardiovascular disease in the last three months before study participation. * Previously diagnosed Osteoporosis * SIJ dysfunction is evaluated by a positive compression test. * BMI over 35. * Skin allergy or hypersensitivity that can lead to skin irritation due to IASTM/SASTM tools.