"Sit with your legs crossed", a ** sitting posture that is complained about by everyone every day.
A casual shot on the subway one day. **Editor's shooting, but some time ago, there was a very popular saying on the Internet: sitting with your legs crossed is the healthiest sitting posture, because it can better maintain the neutrality of the spine. 
on the Internet.
Is there any truth to this claim? What is the right way to sit? Correct sitting posture
There is only one key
Let's start with a test and choose what you think is the correct sitting position in the picture below
References[1].
The above ** is from a study "Physicists' Perception of Optimal Sitting and Standing Posture". This review surveyed 544 Greek physicists to investigate their perceptions of optimal standing and sitting postures, and how they describe and quantify postural characteristics and optimal posture. 97.5% of physicists chose pose, and nearly half of them (41.)4% ) chose Position 2 – the lumbar spine is in lordosis, the thoracic spine is slightly kyphosis, the pelvis, head and shoulders are in a straight line, and the chin is moderate**. This posture is consistent with the physiological curvature of the human spine. In fact,The key to correct sitting posture is mainly to keep the spine perpendicular to the horizontal plane, and it has little to do with whether the legs are crossed or notThis posture does not put too much pressure on the spine and prevents the spine from being in an abnormal arc due to excessive pressure. 4 steps to a healthy sitting position
Find the ischial bones
Touch your ass and find two hard bonesThis is our ischial tuberosity, which is where the main force is applied when sitting, and it can transmit gravity downward. Thin people are easy to touch, and people with a lot of meat can sit down and feel the pressure of the two bones, and the force on both sides should be the same, not biased to one side.
Determine the position of the hip and knee joints
The knees and hips should be at a 90-degree right angle, with the feet flat on the ground. As for the angle of the legs, it should vary depending on the person's constitution. Remember not to over-deduct or over-skim, and it's best to keep your feet shoulder-width apart.
Maintain the curve of the spine
Memorize the direction of the four curves of the human spine. Feel it yourself, your upper body is upright, your waist is as far forward as possible, your chest is slightly convex, and your head is raised but your chin is slightly retracted. Adjust the position of the computer screen according to the direction of your gaze to avoid leaning over, bowing your head and other bad actions. 
Correct sitting posture. Gallery copyright**, use may lead to copyright disputes.
Finally, check whether the head, shoulders, and hips are on a perpendicular line
Ideally, both ears should be aligned at the shoulders。Keeping your head, shoulders and hips in a vertical line with your shoulders down will help eliminate the tension in your shoulders and relieve the pain of your shoulders and back from sitting for a long time.
If you want to get the correct sitting posture, it takes time to adjust the posture slowly, and it may not be 100% correct now, but if this article can attract everyone's attention, avoid wrong sitting posture, and achieve the correct sitting posture as much as possible, our goal will be achievedDon't make these mistakes again
Stilt legs
The stilted legs will tilt the pelvis and the lumbar spine will be compressed unevenly, which will lead to scoliosis over time. Prolonged compression of blood vessels leads to impaired blood circulation, varicose veins or vascular embolism of the lower limbs. Prolonged compression of the medial compartment of the knee joint leads to damage to the cartilage and increases the risk of osteoarthritis.
Sit with your waist in the air
This posture of "paralyzing" in a chair looks very relaxing, but it is actually more harmful. Waist overhang, thoracolumbar kyphosis, will increase the load on the waist, damage to the muscles behind the waist, and even lumbar disc herniation. In addition, the main focus of this pose is on the sacrococcygeal region (i.e., at the base of the tail), which is prone to sacrococcygeal pain.
Lean forward and sit
When you sit forward, the muscles in your lower back pull your torso hard like a tensed bowstring, and the prolonged contraction can cause pain and spasms in the lower back muscles.
"Ge You Lie".
Is there a few people who have not done "Ge You Lying". However, the harm caused to our body by this comfortable movement should not be underestimated. The reason why this action feels comfortable is because the muscles of the waist and neck are not used, the back is suspended, the spine is in a state of imbalance in this position, the whole body sinks, and the central axis moves back, which can easily cause cervical spondylosis, lumbar disc herniation and even spinal deformity.
Keep your head up and your chest high
This posture may surprise many people, and what we think of as the correct sitting posture from childhood may not be so scientific. Because our thoracic spine is physiologically kyphosis, if the chest is too high, it will reduce the normal physiological curvature. 
Gallery copyright**, use may lead to copyright disputes Finally, remind everyone, regardless of whether the sitting posture is correct or not,Sitting for long periods of time is not beneficial, and it is recommended that you stand for 5-10 minutes for every 1 hour of sitting.