There are many reasons for ankle stiffness. The first effective exercise method for ankle stiffness after trauma is stretching. Minor stiffness can be self-stretching, using fascial balls, passive dorsiflexion and passive toe flexion, but of course, if it is serious, you need to go to the hospital and rely on the therapist to perform joint manipulation to loosen the joint. The second is the activation of the intrinsic muscles of the foot, that is, the grasping and stretching of the toes, which is easily understood by doing the hammer-scissors action with the toes. The third is to do activation and training of the muscles around the ankle joint. For example, external resistance, internal resistance, dorsiflexion resistance and toe flexion resistance of the foot. The fourth is to do training of proprioception and balance function. Fifthly, we have to do whole body coordination training.