Currently, the Karen system is widely used in various disciplines such as rehabilitation and sports medicine, from neurological disorders of motor control, cognition and proprioception, orthopedic disorders of balance, gait and core stability, to the enhancement of sports control and the recovery of sports injuries, etc., all of which have achieved significant therapeutic enhancement. Most importantly, the system adjusts the (virtual) environment by targeting the patient’s level of impairment, which can help the patient break through the environmental constraints, achieve personalized medicine in the true sense, restore the patient’s confidence and strengthen the subjective initiative, mobilize motivation and stimulate the patient’s potential. Karen system whole-body movement analysis of all limbs and improve the training of motor ability, record all the relevant data of the patient in the exercise rehabilitation training. Cognitive and motor therapy integration of dual-task training, for elderly patients this dual-task training can not only improve the patient’s ability to prevent falls, but also improve the overall coordination of the patient, thus reducing the chances of injury due to accidents, and play a role in increasing life expectancy and improving the quality of life.