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 ...

Cracking your knuckles might feel satisfying, but it often earns disapproving looks or even dire warnings. For decades, people have believed that this seemingly harmless habit could lead to arthritis ...