A common way of sitting is with a curved back, which puts uneven pressure on your spine. Over time, this causes wear and tear in your spinal discs, overworks certain ligaments and joints, and puts strain on muscles that stretch to accommodate your backs’ curved position.
This hunched shape also shrinks your chest cavity while you sit, meaning your lungs have less space to expand into when you breathe. That’s a problem, because it temporarily limits the amount of oxygen that fills your lungs.
Being stationary actually reduces blood flow and the amount of oxygen entering your bloodstream through your lungs. Your brain requires both of those things to remain alert, which means that staying seated all day doesn’t make for better concentration.
So, what can you do? Sitting up straight is a big help, and aim to move around much more - once a half hour, even! Maybe…you should get up and take a walk, right now!