Functional exercise as the name suggests is to improve the local function, such as the shoulder joint does not function well, through various methods to solve the local dysfunction points, pain, muscle weakness, with manipulation, electrical stimulation or physical therapy to improve the function of the shoulder. If the function of the hand is not good, can’t hold things, can improve the function of the hand to hold things through rehabilitation exercises, set up games. If the function of the lower limbs, can not stand, sit, walk, through a reasonable rehabilitation program to help patients to improve the corresponding function. For example, if the localized knee joint cannot flex and extend after surgery, the function of flexion and extension of the knee joint can be solved through the method of loosening, through the method of drug ion introduction, through the method of physical therapy, etc. These are for the localized dysfunction. All of these are for localized functional disorders, and to improve the function after solving them is called functional exercise.