Functional ankle exercises, including the exercise of the muscles around the ankle joint as well as the training of the range of motion of the ankle joint. The specific ways are heel lifting exercises, resisted ankle valgus, active ankle dorsiflexion and extension, active ankle valgus, deep squatting and so on. 1. Heel lifting exercise: Separate your feet, shoulder-width apart, count 1, 2, 3 slowly, and lift your heels until your toes touch the ground. Then slowly fall back to the ground, 20 times per group, 2 to 3 groups at a time. 2. Resist ankle valgus: sit on the bed, legs out, under the knee pad pillow, so that the leg to maintain a slightly flexed posture. Knot the rubber band into a ring around the toes. Resist the rubber band resistance force to separate the toes, in the highest position to maintain a certain period of time or complete the action for 1 time. 3. Active ankle flexion and extension: sit on the bed, straighten the leg, tense the toes and hook the toes slowly, forcefully and maximally, generally hold the toes at the limit for 10-20 seconds, 10 times/group. 4. Active ankle internal and external rotation: sit on the bed, leg outstretched, put a pillow under the knee, keep the leg in a slightly flexed position. Slowly, forcefully, maximize the toes to the inside and outside respectively, generally at the limit of 10-20 seconds, 10 times / group. 5. Deep squat: full squat under the protection of hand-held objects, the body is straight, the heel does not leave the ground, as far as possible to make the buttocks touch the heel. To the ankle joint around the muscle capsule of the pulling sensation and mild pain to keep about 5 minutes. Do not contract the muscles to fight against, should be completely relaxed, otherwise it will be ineffective. The above exercises help to strengthen the muscles around the ankle joint and improve joint mobility. It is recommended to perform the exercises under the guidance of a physician.