Thanks SLChan for sharing this great information in his facebook.
One of the Taichi Principles emphasizes body alignment which is well explained in this photo: "neck is held straight with ease" "tuck in the chin and feel as the crown is suspended from the top", "The head should be erect and upright in order for the shen 神 (spirit) to reach the headtop“
For every inch that the head moves forward in posture, it increases the weight of the head on the neck by 10 pounds!
Poor neck posture leads to a Forward Head Position which is one of the most common causes of neck, head and shoulder tension and pain. This can be a result of injuries like sprains and strains of the neck leading to weak neck muscles, poor sleeping positions and the illustrated examples of driving stress, computer neck, couch neck and readers neck along with improper breathing habits.
The extra pressure on the neck from altered posture flattens the normal curve of the cervical spine resulting in abnormal strain of muscles, ligaments, bones and joints of the neck causing the joints to deteriorate faster than normal resulting in degenerative joint disease or neck arthritis as indicated in an article published in the Spine Journal, recognized internationally as the leading journal in its field and the leading subspecialty journal for the treatment of spinal disorders, 1986;6:591-694.
The source of information is from: MaxLifeChiropractic