In the event of flat feet, you can practice the arch by the following methods: 1, functional exercise: gradually restore the height of the arch by means of functional exercise, toe walking, toe flexion exercise, which can increase the height of the arch, in addition, you can also practice heel lifting, external rotation exercise, or toe flexion functional exercise, use a rubber band, rubber band wrapped around the bottom of the foot, pull upward, and then in 2, orthopedic insoles: use orthopedic insoles, put insoles in the inner side of the foot, so that the inner side of the arch is raised about 2-3cm, which can play a supporting role for the arch in the long run, so that the arch gradually returns to normal.