Hello, there are many reasons for low back pain, such as lumbar soft tissue injury, lumbar muscle strain, lumbar disc herniation, spinal canal stenosis and so on, which can all cause low back pain. Therefore, low back pain should go to the hospital for orthopedic examination in order to rule out substantive lesions.
As for fitness, we must first rule out the substantial diseases of the waist, and then exercise the waist to prevent the illness from getting worse.