Your core muscles have a lot to do with your posture. Having a hunched back is generally associated with old age. However, people of any age can have kyphosis (abnormal curvature of the spine).
Of course, aging isn’t the only cause of weak core muscles. Laziness such as slouching--hey we all do it--is another cause. Throughout our lives, we may never extend the neck to its full range, and so the muscles shorten. Long hours of reading, sewing, typing, or standing at a workbench take their toll.
Core Muscles Include:
Focusing on strengthening the above muscles will not only improve posture but help prevent low muscular back pain, avoid back injury, improve physical performance, and improve your balance.
15 to 20 minutes of core exercises, 3 times per week is all it takes.