During holidays, busy people rarely have a good rest, watching TV, playing games, sitting down, and unconsciously bending down. After discovering it, he quickly straightened his waist, but soon he bent down again. Do we have to sit up straight to protect our waist? Lying on a rocking chair is so comfortable that you won't feel back pain or soreness all afternoon, and you may even fall asleep unconsciously. The question is, since lying back is more comfortable than sitting straight, is sitting straight still the correct sitting posture? Let's take a look at the conclusions of scientific research. A professor named Wilke from abroad conducted an experiment in which he found a 45 year old male volunteer and placed a pressure sensor in the nucleus pulposus tissue between the 4th and 5th lumbar vertebrae to measure the pressure of the intervertebral disc at different positions. The results obtained from the experiment are as follows: When in a supine position, the intervertebral disc pressure is the smallest, only 0.1 megapascals, which can be imagined; When sitting upright, which is the recommended posture, the intervertebral disc pressure is 0.46 megapascals; When sitting in a forward leaning position, i.e. bending forward with the waist, the intervertebral disc pressure is 0.83 megapascals. It can be seen from this that when bending forward and sitting, the pressure on the intervertebral disc is about twice that of when sitting upright, which is also expected. However, the following values surprised us - the pressure on the intervertebral disc in a reclining position was 0.3 megapascals, which was even lower than the pressure when sitting upright! Isn't the reclining position commonly referred to as "sofa paralysis"? Have we really misunderstood it for so many years? Professor Wilke's experimental results are not wrong. The sitting position with a backrest does indeed have the least pressure on the waist among all sitting positions, but this does not mean that a sitting position like "sofa paralysis" does not harm the waist! There is actually a difference between "sofa paralysis" and sitting in a reclined position. When the sofa is paralyzed, the back of the waist is suspended without support, and the lumbar spine will change its original curvature due to insufficient support. This will increase the pressure on the intervertebral disc, accelerating its degeneration. When sitting in a back leaning position, there is support behind the waist, so "leaning" is the key. The spine also has its favorite sitting position. Returning to the work environment makes it difficult for us to achieve a back leaning position using a computer. So, what is the correct sitting posture? Professor Esther Gohler from Stanford University in the United States has proposed a favorite sitting posture for the spine through research: choose a seat with a backrest, sit back as much as possible, let your hips fill the seat, then let your back away from the backrest, naturally lean forward, "elongate" your back, and let your spine have an upward stretching trend. Then, relax your shoulders and slowly push yourself back to the backrest. This is the spine's favorite sitting position. On the basis of maintaining the above sitting posture, sedentary individuals can also place appropriately sized cushions (which can also be towel rolls or clothes) on the back at the same height as their navel, and then stretch their back to prevent the waist and back from hanging in the air. Finally, it should be noted that even if a good sitting posture is maintained, prolonged sitting can still lead to back pain and lower back pain, and can "sit and wait for illness". Many illnesses are caused by sitting! It is recommended that everyone change their posture frequently when working for a long time, and get up and move around for about an hour to relax their muscles. But now everyone is under a lot of work pressure and has a fast pace, so they may not be able to get up and move around as soon as they get busy. Let me introduce a deadly tool for sitting for a long time - "Drink plenty of water". We can tolerate back pain and soreness after sitting for a long time, but after drinking plenty of water, the bladder is honest. Drinking plenty of water means you must go to the bathroom frequently, and when going to the bathroom, you must get up and move around. So, be sure to drink plenty of water while working, and continue drinking after using the bathroom. This cycle can force you to get up and walk every 1-2 hours. If your workstation is far from the bathroom, congratulations, the exercise time has been longer. (Lai Xin She)