Comparison of High-Intensity Interval Training With Moderate-Intensity Continuous Training in Chronic Non-Specific Low Back Pain Patients

The goal of this clinical trial is to compare the HIIT with MICT in chronic non-specific low back pain patients. The main questions it aims to answer are: * The broad aim of the study is to compare HIIT with MICT in pain reduction in chronic non-specific low back pain patients. * The purpose of this research is to compare HIIT with MICT on disability and quality of life among chronic non-specific low back pain patients. * It also attempts to investigate the relationship between the baseline attributes and outcome variables. Researcher will compare the HIIT to MICT to see the effects on CNSLBP Participants will be: * Allocated to HIIT or MICT group for 6 weeks. * Assessed pre and post intervention. * Continuously monitored during treatment sessions.

Inclusion Criteria: * Referred patients of back pain persisting for \> 12 weeks with no identifiable specific cause or underlying pathology from DUH OPD who meet the eligibility criteria. * Age group 20-48 with either gender. * NPRS score ranging between 3 and 5 (mild to moderate). * Modified ODI score is mild to moderate. Exclusion Criteria: * Any client with a specific cause of LBP (neurological problems, fractures, malignancy, infections, or rheumatic diseases such as RA or ankylosing spondylitis). * Any client with cardiopulmonary problems (recent myocardial infarction, uncontrolled hypertension, asthma, COPD). * Any client with musculoskeletal disorders \[injuries limiting exercises, spine injuries, recent trauma (fracture), scoliosis by Forward Adam's test\]. * Any client with metabolic conditions (thyroid problems, uncontrolled diabetes). * Pregnancy / first 3-6 months postpartum. * Recent surgery.