The knee, the largest and most complex joint in the human body, is a hinge joint, and it is one of the few joints in our body that can only move in one direction. The knee is also the largest weight-bearing joint in the human body, with the average human knee joint being able to support 35 kg of weight. The more weight you carry, the greater the chance of wear and tear on the joint cartilage, and the tendons are prone to injury, resulting in faster degeneration of the knee joint. According to research statistics, the weight-bearing multiples of the knee are as follows: 1. When lying down, the weight-bearing of the knee is almost zero. 2. When standing up and walking, the weight-bearing of the knee is about 1 to 2 times. 3.When going up and down slopes or up and down steps, the weight on the knee is about 3 to 4 times. 4.When running, the weight of the knee is about 4 times. 5.When playing ball, the weight of the knee is about 6 times. 6, squatting and kneeling, the weight of the knee is about 8 times. For example: a person weighing 50kg, for each step, the knees have to bear about 200kg of weight. (50*4 times)