Yoga for Chronic Low Back Pain and Its Mechanism of Action (YoMA)

Inclusion Criteria: * Chronic low back pain lasting \> 3 months * Back pain that is rated at least 3 on a numeric pain rating scale that ranges from 0 to 10 (0-no pain, 10 worst pain imaginable). * English language fluency Exclusion Criteria: * BMI \> 40 * Inability to provide informed consent * Recent diagnosis of abdominal aneurism * Recent diagnosis of metastatic cancer * Recent diagnosis of discitis * Recent diagnosis of disk disease * Recent diagnosis of spinal stenosis * Recent diagnosis of spondylolisthesis * Recent diagnosis of infectious cause of back pain * Recent diagnosis of fracture of vertebra * Recent diagnosis of Fibromyalgia * Recent diagnosis of rheumatoid arthritis * Recent diagnosis of ankylosing spondylitis * Recent diagnosis of paralysis * Pregnancy * Prior or planned back surgery * Blindness or severe vision problems * Deafness or severe hearing problems * Bipolar or manic depression and not taking medication * Major depression * Psychoses (major) * a substance abuse condition * Dementia * Unable to get up and down from the floor * Involvement in a lawsuit related to back pain * Lack of transportation * Other disabling chronic conditions (e.g., disabling heart or lung disease, diabetic neuropathy, receiving treatment for hepatitis) * Currently (within the past 3 months) using yoga classes for more than 15 minutes per week * Inability to be contacted by phone or email * no computer access * schedule does not allow for participation in classes/home practice * planning to move out of town or take a long vacation during the period of the study