The concept of spinal stability was first introduced by Write et al. in 1987, and is considered to be “clinically stable” when the structures of the spine are able to maintain their normal position in relation to each other under physiological conditions without causing compression or damage to the spinal cord or spinal nerve roots, and without significant deformity or pain. It is the deep muscles, the stabilizing muscles, that keep the spine stable. What we call core muscle training is mainly to train the lumbar stabilizing muscles, that is, the deep muscles. The core of the treatment is to activate the “dormant” or inactivated muscles and restore their normal function. The reactivation of deactivated muscles without pain is accomplished through sensory-motor stimulation techniques, which allow the information sent or received by the brain, spinal cord or intramuscular receptors to be reintegrated and recoded into the motor program. In short, it awakens previously “dormant” muscles and reestablishes their normal patterns and neural control patterns. The principles of lumbar stabilization training should be followed as much as possible: 1. train the stabilizing muscles in a neutral position to achieve joint protection skills 2. train mainly with isometric contractions 3. train mainly with closed chain movements 4. follow the principle of gradual progression 5. train pain-free and maintain correct posture. Pain may mean excessive training load, and incorrect posture is often due to the patient using the wrong movement pattern to complete the movement. That is, the overall motor muscle compensates for the weak local stabilizing muscle. A few specific training methods: Double-legged bridge: supine position, hip and knee flexion, low back force, lifting the low back and hips to straighten the hip joint, can maintain the posture for tens of seconds to increase the proprioception of the low back. One-legged bridge: supine position, left lower limb hip flexion and knee flexion, right leg straight, low back force, lift the low back, hips and right lower limb, make the bilateral hip joints straight in the air, maintain only the shoulders and left leg as the body’s fulcrum for a few seconds. Exchange the supporting foot and complete the same action, which has a stimulating effect on the lumbar multifidus. Side lying full body lift: Lie on your side, support your body with your elbows, use your elbows and ankles as fulcrums, lift your body upwards into a straight line and maintain the movement for a few seconds. Lateral Half Body Lift: Lie on your side, support your body with your elbows, use your elbows and knees as fulcrums, lift your body above your knees upwards and maintain the movement for several seconds. Four-point support (abdominal bridge): prone position, with both elbows and feet as the fulcrum, the body is propped up and suspended in the air, the body is in a zigzag shape, maintain the movement for a few seconds. Modified sit-ups: supine position, bending the hips and knees, hands clasped in front of the chest, avoiding neck force, try to use the abdominal muscles to complete the sit-ups, requiring the shoulders to leave the bed surface 10cm. Kneeling diagonal support: take the kneeling position, support the body with both hands and both knees, straighten both upper limbs, bend both hips, bend both knees 90°, then straighten the left upper limb forward and extend the right lower limb backward so that the body is supported by the right hand and left knee only.