When I was in school, my teacher always told me "Sit up straight stop slouching!". I am sure many others have heard this too, the thing is though, sitting up with straight back is very uncomfortable, and your back gets tired.
Not always are you told WHY you should do it either. But sometimes it's because you look lazy, and it's improper to slouch, sometimes you're told because it's better for your back to sit straight.
I focus this question on the health aspect of sitting up straight.
I know, I sound like your second grade teacher, or your mother at the dinner table with those constant, nagging phrases that used to drive us nuts, “Sit up straight!”1
Now, I hear patients coming into the clinic complaining of their spouses getting on their last nerve because they’re not standing up straight. But, if your spouse is telling you to sit up straight, he/she could be saving your body from many issues.1
What is good posture?
Posture is the position in which you hold your body upright against gravity while standing, sitting or lying down. Good posture involves training your body to stand, walk, sit and lie in positions where the least strain is placed on supporting muscles and ligaments during movement or weight-bearing activities.2
Correct sitting position
Sit up with your back straight and your shoulders back. Your buttocks should touch the back of your chair.2
Sitting with back at 90 degree, is not comfortable at all, even if you're being told so. And also you're told it's the best way for your back. But if something is uncomfortable, it might be a warning from your body. Is sitting straight really good for the health of your back?