The cervical spine is movable, and this activity is based on the stability of the cervical spine. According to morphological and physiological characteristics, the cervical spine is divided into upper and lower cervical spine by the second cervical vertebrae. The activity of the upper cervical spine is mainly related to the position and vision of the eyes and controls the human body standing with the head in a neutral position, so the upper cervical spine muscles are richly innervated, which makes the muscle activity highly precise. The upper and lower cervical spine flexion and extension movements are often in opposite directions. When the jaw is inward, the upper cervical spine translates backward thereby causing the upper cervical spine to flex and the lower cervical spine to extend backward at the same time; when the jaw is upward, the upper cervical spine translates forward thereby causing the upper cervical spine to extend backward and the lower cervical spine to flex forward at the same time. The balance of the normal cervical spine is maintained by two aspects, one is endogenous stability, including the vertebral body, accessories, intervertebral discs and connected ligaments, which is static balance. The second is exogenous stability, including muscle regulation and control, which is the original driving force of spinal motion, and is dynamic balance. Endogenous stability is the basis of spinal stability, and exogenous stability is the prerequisite for spinal stability. A large number of studies in recent years have confirmed that the development of cervical spondylosis is closely related to lesions in the muscular system surrounding the cervical spine. Damage to muscle fibers and weakening of muscle strength directly lead to disruption of the dynamic and static balance of the cervical spine and decrease in mechanical properties and aggravate the degeneration of the cervical spine. Isometric resistance training is a kind of stability training, during which there is only a small movement or no movement of the vertebral body. It can effectively achieve the effect of training the neck muscles and alleviate or reduce the symptoms. When the patient’s muscle endurance is restored to a certain level, dynamic training can be performed to enhance the stability of the patient’s core muscles and the overall stability of the neck. Dynamic training is not a substitute for stability training. If the patient does not achieve effective stability and control of the neck, dynamic training will aggravate the patient’s symptoms. Self-resistance of isometric training: The resistance ranges from small to large, depending on the patient’s symptoms and tolerance level. Patient’s posture: sitting position Flexion: the patient places both hands on the forehead, the palms of the hands apply force, and the impedance nods forward without moving the head to maintain balance. Lateral bending: The patient places his hands on the other hand to resist the lateral bending of the head. The patient strives to put his ears on his shoulders, but cannot do so due to the force against them. Extension: The patient’s hands are placed at the back of the head, close to the upper part of the head. Against the force of axial extension, the head does not move and balance is achieved. Rotation: The patient’s hands exert resistance on the superior lateral aspect of the eye, impeding the patient’s force to rotate the head to look at the shoulder. Isometric resistance activity: (1) Patient’s position: In the standing position, an inflatable ball the size of a basketball is placed between the forehead and the wall, and the patient contracts the chin. Process: The patient’s upper extremity starts to move, and the upper extremity gradually carries out weight-bearing activities, and the patient has to keep the head and neck in the above position . (2) Position of the patient: supine position. The head is at the edge of the mat; the neck is unsupported and remains in a neutral position. Procedure: Gradually increase the movement of the upper extremity and perform weight-bearing activities of the upper extremity within the tolerated range. The patient is to maintain the head and neck in the above safe functional position. Dynamic neck flexion: Home training emphasizes flexion of the head and neck rather than lifting the head up. Patient’s position: supine position. If the patient is unable to contract the chin and flex the neck to keep the head off the mat. Place a wedge-shaped mat or inclined plate on the patient’s chest and back and under the head to reduce the effect of gravity on the head and neck. Procedure: The patient contracts the chin and flexes the neck to raise the head. The therapist corrects the patient’s incorrect movement pattern using the sternocleidomastoid muscle. When the patient’s movement pattern is correct, the angle of inclination of the wedge pad or inclined plate is reduced to provide resistance against the patient’s head and neck flexion. Intermediate and advanced training: further training of the head and neck muscles for stability and control. (1) Position of the patient: standing position. An inflatable ball the size of a basketball is placed between the patient’s head and the wall. Procedure: The patient rolls this ball against the wall with his head as he walks around. (2) Patient position: The patient sits on a large size exercise ball and rolls the ball so that the thoracic back is flat on the ball and the neck and head remain in a neutral position, emphasizing the neck flexors at this time. Procedure: The patient rolls this ball with the back of the chest so that the center of the ball reaches the head, at which point the activity of the neck extensor muscles is emphasized. The patient has to roll the exercise ball back and forth over the chest and back and head to train the stability of the neck extensor and flexor muscles. During the exercise, the upper limbs can be moved, gradually increasing the upper limb weight-bearing and continuously increasing the difficulty.