Poor posture associated with the constant use of a computer. When people are "hunched over" their computers and especially their phones and tablets for hours on end, chest muscles tighten and upper back muscles lengthen, causing pain in the neck, back and limbs. Exercises that counter the position should be done from time to time.
Unfortunately, kids are spending way too much time hunching over their devices starting at an early age, which does not bode well for their spinal health in the future. See medical conditions
Four Out of Four
People used to read the paper standing in line waiting for a bus. Not any longer.