OUR BRAINS ARE HARD WIRED TO seek IMMEDIATE, SHORT-TERM comfort and the avoidance of pain at all times ... Especially while we are seated.
 
We consciously and unconsciously seek and maneuver into seatED positions that enable us to use the least amount of energy while promoting comfort. 
 
So we slouch, almost always, all of us.  For those of us working at a desk, students and all others who sit in a chair regularly for long periods of time, our brains disregard proper postural mechanics and seek to use as little energy as possible.  
 
So we bend our backs into convex slouches and PROTRUDE INTO THE SEAT cushion to restrain our back and relax our back muscles.  But, this PROCESS WILL NEVER PROMOTE PROPER AND HEALTHY spinal development and, OVER TIME, WILL BE THE CAUSE OF chronic injury for repeated stress of spinal joints.