Reasons I think this is probably bullshit<p>1) He claims that computer/phone induced postural changes are responsible for the forward stoop which occurs with age - the 'dowager's hump' - yet this phenomenon has been known about for centuries and there is no evidence that it has increased in prevalence or severity<p>2) He claims this technique comes from a 'chiropractor'<p>3) The concept of 'stimulating the C5 nerve' (which isn't even a nerve, its a nerve root) is pretty meaningless<p>4) The resultant sensation of temporarily improved posture that one gets after performing this exercise is very brief, and there is no evidence it persists<p>Indeed one can create a similar effect in the arms: Cross your arms at the wrists and touch the backs of your hands together. Pull your hands apart so that there is pressure applied to the backs of the hands and maintain this pressure for about thirty seconds. Then hold your hands in front of you, and you will notice they tend to move apart. I imagine that a similar process occurs following this exercise. However you will notice that both the separation of your hands, and the sensation of your head being pulled back following the exercise in the video, is not at all permanent.