I have a routine for when I get home from work: Crack each toe, then my ankles, both knees, pelvic bone (a particularly good one), twist-crack my lower back, both shoulders, my wrists, then each and ...

It's a sound that hurts those who hear it. You may have a habit of cracking your neck, so much so that it's become automatic. This gesture, which seems to provide spontaneous relief, is nevertheless ...