“For every inch of Forward Head Posture, it can increase the weight of the head on the spine by an additional 10 pounds.” -Kapandji, Physiology of Joints, Vol. 3
To convert that to metric for you, the average head is 12lbs or 5.44 kgs, if you slouch forward one inch or 2.54 cm your shoulders are now wearing 14.51 kgs. Move it forward some more (another inch/2.54cm) and it now puts 19 kgs of weight on your spine at the junction of your shoulders.
For every centimetre you move forward another 1.78kg of weight is felt by your spine.
In the long term this puts your neck under so much stress that the vertebrae themselves will change structurally due to the stress. Wear the weight over your shoulders as you were designed to and less weight will be experienced by your spine.
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