Orthopedics hates the 3 actions you do the most, have you been tricked?
The human body is like a building, and the bones are the reinforced concrete that supports this building, and we have 206 bones in our body, in order to protect our bones? We'd better not do these three actions in the future.
The first spine, the most annoying movement of the spine is cross-sitting.
There are many similarities between this pose and what we often call "Erlang legs", the difference is that one is a cross of the thighs, and the other is a superposition of the calf to the ankle. However, the harm caused by this posture is similar to that of the "Erlang Leg", and sometimes even more severe, because this posture is more likely to cause pelvic tilt.
The second lumbar spine, the most annoying movement of the lumbar spine is sit-ups.
While this is a well-popular sport, it is also a relatively poor one. Sit-ups are meant to work the abdominal muscles, but the forward flexion of the spine puts a lot of pressure on the discs.
The third knee, the most annoying movement of the knee is going down stairs or going down a hill too fast.
When we go down stairs or down a hill, the knee joint will bear a lot of ground impact, coupled with the action of inertia, we tend to go down very fast, which will bring more impact to the knee. If you are going to hike the mountain, it is advisable to have trekking poles ready to reduce the impact on your knees. In addition, going down sideways is also a method that can be tried, and it can also reduce the burden on the knees.