Beneficial exercises include: 1, walking, swimming, supine straight leg raises or resistance training and flexion and extension of joints in non-weight-bearing positions. 2, incorrect excessive exercise can aggravate osteoarthritis. Activities such as climbing mountains, stairs or squatting and standing. 3, suitable for the elderly specific exercise method is: sitting or supine position, the knee joint straight, tense thigh muscles, foot to the head dorsiflexion, while tense calf muscles, each time adhere to three or four seconds, 10 times per minute, for three or four minutes. You can do it three or four times a day. Osteoarthritis self-care: 1, do not wear high heels when walking long distances, in order to reduce the impact on the knee joint, to avoid wear and tear on the knee joint. 2, avoid squatting for a long time, often change posture to prevent the knee joint fixed a posture and excessive force. Try to go up and down stairs, climb less, and carry less heavy objects to avoid overloading the knee joint and aggravating the condition. 3, when riding a bicycle, adjust the height of the seat, the seat is too high, too low or pedal hard when riding uphill, have a negative impact on the knee joint, should be overcome. 4, to properly increase outdoor activities, exercise, and try to avoid long-term bed rest. 5. Actively lose weight and control your weight. Prevent the burden on the knee joint. 6, eat high calcium food more milk, eggs, soy products, vegetables and fruits. 7. Keep the knee joint warm in cold weather, and bring knee pads if necessary to prevent the knee joint from getting cold. 8. Swimming and walking are the best exercises.