1, go flat. You can take a walk on a flat road. Squat down and turn your knees to warm up before you go. When walking, the legs should be raised slowly and put down gently to avoid aggravating knee joint injury. Walk 60 steps per minute, not too fast, and it's best to walk for half an hour to an hour at a time.

2. swim more. In the water, the weight of the joints will be reduced, and it is best to breaststroke without hurting the knees.

3. ride a bike. It is still possible to ride a spinning bike in the gym. Riding joints will not bear loads, which is beneficial to the maintenance and recovery of joint functions. However, the height of the seat needs to be adjusted. It is not good to sit too high or too low, and don't tread too hard when going uphill.

4. Practice yoga. Lying on your back and straightening your legs is also a good way to exercise. Lift the leg for about 30 degrees, which can last for 1~3 minutes at first, and lift the leg alternately according to the teacher's requirements. You can also do more squats and squats to strengthen your knees.

Knee is a part of human body, located at the joint of thigh and calf. The main internal structure of the knee is the meniscus and four ligaments.

Meniscus is a crescent-shaped fibrous cartilage tissue at the junction of the lower femur and the upper tibia in the knee joint, which is used to cushion the vibration of the knee joint and avoid direct friction between the two bones.