Reasons for bad posture
We rarely see people with good posture, the ones with bad posture are the majority.
The reason is clear: The traditional seat forces the pelvis to turn backwards, which puts the person almost inevitably to a bad posture where the back is rounded. This stretches the ligaments between vertebrae, making the spine structurally hunched.
This 90/90-degree sitting posture is therefore by far the most important factor when it comes to posture. In practice, this cannot be helped. One can try to prevent this by sitting on the very edge of the chair, legs apart, pushing the pelvis forward and relaxing the shoulders.
Fortunately, there is a way to maintain and even correct the good posture: the two-part saddle chair.
The gap in the middle gives space to the pubic bone and the genitals above, so that the pelvis can be vertical, in the same position as when standing. If the table (electrical table!) and monitor heights are adjusted correctly, even a very poor posture can be repaired in less than 2 years in sitting work. If your back is already deteriorated (pains), you should choose a two-part, swinging saddle chair and adjust its swing mechanism so that it swings easily.
Another thing that causes bad posture is driving. For some inexplicable reason the driver’s (and passenger’s) seats are designed so that the posture collapses. When the seat is getting old, the phenomenon is getting worse. A support for the lower back helps.
The third incomprehensible posture-ruining environment is school. Basically all traditional school furniture are making the posture worse. Schools should change their sitting ergonomics. Children get bad posture even quicker than adults because their muscles are weaker. At home, children should have adjustable saddle chair furniture. Sitting on the sofa is also bad.
Posture is important because it affects the health of your back (deterioration), the depth of breathing, intestinal well-being and even the internal pelvic organs, shoulder and upper back pains, and the brain circulation.
Unfortunately, exercising at the gym does not correct the posture, because the posture is more affected by ligaments than muscles.