The period of growing up is vital for the development of good posture. Various influences of the environment (sitting for extended periods, carrying heavy school bags in one hand, crouching over the desk, etc.) may lead to permanent inadequate posture. A child with poor posture becomes an adult with bad posture. Later in life, movement, maintaining balance, and work cause more muscular strain. The results are fatigue, lower productivity, and faster aging of tissue.
The good news is that poor posture is often the consequence of insufficient and incorrect muscle activity. It can be improved entirely by will and discipline (as opposed to deformation or injury).
I find the idea of a movable seat essential in preventing bad posture and the degeneration of discs. I would recommend SpinaliS chair as early as in school-age. It allows active sitting, strengthens the muscles while simultaneously gives children the freedom of moving.