Inclusion Criteria:  Chronic non-specific LBP (>3 months), defined as pain in the region between the lower ribs and gluteal folds, with or without leg pain. Aged between 18 to 60 years old. English or French speakers At least a 4/10 score on an 11-point Numerical Pain Rating Scale (NPRS) for pain intensity.  The score will be the average of current pain, and best and worst pain over the previous week.  At least a 'moderate' Modified Oswestry Disability Index (ODI) score. Able to undergo MRI exam.  Exclusion Criteria:  Currently undergoing or having received physical therapy treatment in the previous month Consistent motor control training for the low back and / or consistent weightlifting, power-lifting, bodybuilding, or strongman training in the previous 6 weeks History of lumbar surgery Presence of positive lumbosacral dermatomes or myotomes Presence of disease which could affect the stiffness of muscle tissue (collagen tissue disease, hemiplegia, multiple sclerosis, blood clots) Presence of systemic disease (cancer, metabolic syndrome) Presence of rheumatoid arthritis Presence of spinal stenosis, fracture, infection, or tumor Presence of lumbar scoliosis greater than 10 degrees Presence of cardiac arrhythmia Pregnant and breastfeeding women Individuals with epilepsy Individuals at risk for serious bleeding Individuals with pacemakers or metal implants Individuals with aneurysms or heart valve clips Individuals with tattoos or piercings in the lumbar spine Individuals who have taken prescribed muscle relaxants more than once a week over the past month BMI > 30