Poor posture is extremely common, yet few appreciate that it can make you feel tired, cause headaches and diminish your mental acuity. Your head is like a 12 pound bowling ball perched on your shoulders above your spine. For every inch of forward head posture, the weight of your head on the spine and shoulders doubles  This means if your head is abnormally positioned 3 inches forward, it can put 40lbs of gravity pull on your spine.  OUCH!