Look at the angle of the neck, the slump of the chest, and the rounded shoulders. If you sit like that long enough, you will develop neck, shoulder, and back pain. You might even find it difficult to take a full breath. This is called the Startle Reflex. Thomas Hanna called it the Red Light Reflex.
It is rare to meet someone nowadays who doesn't spend significant amounts of time on the computer.
Even senior citizens are now reconnecting with old friends, not to mention staying in touch with grandchildren, via Facebook and email. Children are beginning to use computers on a daily basis, both in school and at home - often in place of outdoor play. Hundreds of millions of people work at computer terminals, often for hours at a stretch without getting up.
Any repeated movement or posture becomes a habit.
If you have to sit for hours, with elbows bent, wrists immobile and fingers typing rapidly, the brain will teach the muscles to be ready to sit and type again, in just the same manner, the next day. The wrists will be tight, the biceps tighter than usual to hold the arms steady and the neck will hold your head right where it needs to be in order to look at your computer screen. Eventually this learned posture can lead to muscular pain, TMJ, carpal tunnel syndrome, back, neck, and shoulder problems. This state of chronically contracted muscles is called Sensory Motor Amnesia. No amount of strengthening and stretching can get rid of this. You must learn how to sense and move your muscles again in order to regain freedom of movement and reverse this posture.
Children have the same potential as adults to become stuck in an habituated, slumped posture - one that tightens the chest, restricts breathing, overuses the back, neck, and shoulder muscles, and can eventually lead to postural dysfunction and muscular pain. They are learning, at an increasingly young age, to slump and tighten the front of their body as they play video games or use their iPads. Encouraging children to spend time outdoors moving - running, riding bicycles, jumping, climbing trees, playing - will go a long way in keeping a child aware of his body and healthier in the long run.
Here are a few helpful Somatic Exercises you can do at your desk every hour. They will teach you to release, relax, and lengthen your muscles - and eliminate neck and shoulder pain - while increasing body awareness.
The Flower - This movement teaches the muscles of the front of the body to release and lengthen so you can stand up to a relaxed and balanced neutral again. This will also help you breath more deeply and fully.
Here are some neck pandiculations that help me when I have to spend time at the computer:
Slowly tighten your left shoulder up toward the ear, as you slowly tighten your neck back toward the left shoulder blade.
You'll feel a contraction at the top of the shoulder and on the left side of the neck.
Slowly lengthen out of the contraction, and allow the neck to lengthen as the chin points to the right chest. The shoulder relaxes back to neutral.
Repeat 3 times, then do the same sequence on the other side.
Remember to move slowly for greater awareness in retraining your muscles to relax.
You are teasing out the muscle tightness, not by stretching, but by pandiculating - tightening first, then lengthening, much like a yawn. This movement should help you become more aware of the habit of hunching the shoulders. Once you're aware of a habit, it's more easily reversible.