Good posture is good health. We're a health conscious society today and good posture is a part of it. Good posture means your bones are properly aligned and your muscles,
joints, and ligaments can work as nature intended. It means your vital organs are in the right position and can function at peak efficiency.
The position of at attention, or standing at attention, is a military posture which involves
the following general postures: standing upright with an assertive and correct posture: famously "chin up, chest out, shoulders back, stomach in".
We tend to lose hip extension as we age, thus slower walking speed. This may lead to subsequent increased risk of having falls. Falls are incredibly dangerous for the elderly population.
Good posture involves training your body to stand, walk, sit and lie in positions where the least strain is placed on supporting muscles and ligaments during movement or weight-bearing activities.
Keeps bones and joints in the correct alignment so that muscles are being used properly.
Helps decrease the abnormal wearing of joint surfaces that could result in arthritis.
Decreases the stress on the ligaments holding the joints of the spine together.
Prevents the spine from becoming fixed in abnormal positions.
Prevents fatigue because muscles are being used more efficiently, allowing the body to use less energy.
Prevents strain or overuse problems.
Prevents backache and muscular pain.
Correct sitting position:
Sit up with your back straight and your shoulders back. Your buttocks should touch the back of your chair.
All three normal back curves should be present while sitting. A small, rolled-up towel or a lumbar roll can be used to help you maintain the normal curves in your back.
When sitting in a chair that rolls and pivots, don't twist at the waist while sitting. Instead, turn your whole body.When standing up from the sitting position, move to the front of the seat of your chair. Stand up by straightening your legs.
Original Pictures and Publication: http://fitnesspainfree.com/why-you-need-to-correct-your-crappy-posture/ and http://my.clevelandclinic.org/health/diseases_conditions/hic_Posture_for_a_Healthy_Back