When you sit for a long period of time, eventually you’ll begin to slouch. And when you’re in a slouched or hunched position, you put serious strain on the discs in your back, particularly in the lower area, as well as joints and muscles. The discs are the cushions that protect the vertebrae from rubbing together, kind of like brake pads.
Tthe longer you sit, the worse your lower back pain gets.
Prolonged sitting -- especially when you use poor posture -- can lead to sciatica, herniated discs, muscle strain, degenerative disc disease, and much more.