Stand with weight mostly on the balls of the feet, not with weight on the heels. Avoid locking your knees.
Keep feet slightly apart, about shoulder-width.
Let arms hang naturally down the sides of the body.
Tuck the chin in a little to keep the head level. Be sure the head is square on top of the neck and spine, not pushed out forward
Stand straight and tall, with shoulders upright.
Stand against a wall with shoulders and bottom touching wall. In this position, the back of the head should also touch the wall if it does not, the head is carried too far forward (anterior head carriage).
Keep the head up and eyes looking straight ahead. Avoid pushing your head forward.
Keep shoulders properly aligned with the rest of the body.
Always bend at the knees, not the waist.
Use the large leg and stomach muscles for lifting, not the lower back.
If necessary, get a supportive belt to help maintain good posture while lifting.
When carrying a heavy or large object, keep it close to the chest.
If carrying something with one arm, switch arms frequently.
When carrying a backpack or purse, keep it as light as possible, and balance the weight on both sides as much as possible, or alternate from side to side.
Sit with the back firmly against the seat for proper back support. The seat should be a proper distance from the pedals and steering wheel to avoid leaning forward or reaching.
The headrest should support the middle of the head to keep it upright. Tilt the headrest forward if possible to make sure that the head-to-headrest distance is not more than four inches.
A relatively firm mattress is generally best for proper back support, although individual preference is very important.
Sleeping on the side or back is usually more comfortable for the back than sleeping on the stomach.
Use a pillow to provide proper support and alignment for the head and shoulders.
Consider putting a rolled-up towel under the neck and a pillow under the knees to better support the spine.
If sleeping on the side, a relatively flat pillow placed between the legs will help keep the spine aligned and straight.
A great side benefit of keeping your head straight, and your ears/shoulders/hips aligned is an improvement in your self-esteem and attitude. If you walk with your head up, you appear more confident, and feel more confident, which improves your attitude and mood, making it easier to walk with your head up.