Maintaining your knees can be done through reasonable exercise, keeping warm, controlling your weight, and taking reasonable calcium supplements. 1. Reasonable exercise: Avoid excessive exercise and too large an exercise range to prevent damage to the knees caused by improper exercise. Before running, jumping and other sports, you should warm up and wear knee pads. Walking, swimming, playing tai chi and other soft aerobic exercise is more conducive to the maintenance of the knee. 2. Keep warm: Pay attention to the warmth of the knee area to avoid getting cold and knee arthritis. When the temperature is relatively low, you can use a towel to apply hot compresses to the knee area, or take a hot bath or sweat steam, which can promote blood circulation and is conducive to the maintenance of the knees. 3. Weight control: to control the weight within the standard range, to prevent overweight to increase the bearing capacity of the knee joint and lead to knee, knee joint damage. 4. Reasonable calcium supplement: if calcium deficiency is prone to osteoporosis of the knee joint, it is recommended to consume eggs, fish, shrimp, beef and other calcium-rich foods in moderation, and if necessary, you can take calcium tablets. It is recommended to take care of your knees under the guidance of your doctor.