Straightening of the physiological curvature of the lumbar spine, if no organic changes have occurred, it usually takes 3-6 months to recover after exercise. Organic changes refer to lumbar disc herniation, lumbar spinal stenosis, lumbar vertebral body deformation, calcification of lumbar anterior and posterior longitudinal ligament and ligamentum flavum, osteoarthritis of lumbar vertebral small joints, etc. The absence of organic lesions indicates that straightening of lumbar vertebral physiological curvature is due to the lumbar muscle strain and imbalance in muscular strength. Through the strength and intensity training of the lumbar back muscles, the lumbar muscles can restore the balance and original compliance, and the relaxation of the lumbar muscles can gradually restore the physiological curvature of the lumbar spine. Muscle exercise usually takes 3-6 months to see a significant effect, so the lumbar spine physiological curvature also needs 3-6 months to recover.