Joint mobility training is not passive exercise, it is an exercise therapy technique that is used to improve joint range of motion and prevent joint contractures. Joint mobility training includes: active exercise, passive exercise assisted exercise, assisted exercise traction, and continuous passive exercise. 1. Active exercise refers to a variety of exercises that patients can accomplish independently without external assistance through various unarmed gymnastics or instrumental activities under the guidance of professionals. 2. Active-assisted movement refers to the active movement completed by the patients themselves with the help of some external forces. Commonly used are suspension exercises, pulley exercises and instrument exercises. (1) Suspension exercises: the use of hooks, ropes and slings to suspend the limbs to be active, so that the limbs in the removal of gravity under the premise of active activities, similar to the pendulum-like movement. (2) Pulley exercise: using pulleys and ropes to help or drive the activity of the affected limb through the activity of the healthy limb. (3) Instrumental exercises: the use of equipment as a booster to drive the movement of the joints with limited mobility, including robot-assisted exercises. 3. Passive exercise is divided into two kinds according to the source of power, one is passive exercise accomplished by the personnel, such as movement within the movable range of limb joints and joint loosening technique; one is passive exercise accomplished by external power, such as pulley exercise, joint traction, functional pedaling, continuous passive activity and so on. It is recommended that patients, timely medical treatment, under the guidance of the doctor to carry out joint mobility disorders training, so as to avoid causing damage and delaying the condition.