Answer:
What is so fragile that saying its name breaks it?
I have two bodies joined together as one. When standing still I run and run.
I march before armies, a thousand salute me. My fall can bring victory, but no one would shoot me. What am I?
People make me, save me, change me, and raise me. What am I?
I have a neck and no head, two arms but no hands. I'm with you to school, I'm with you to work. What am I?
No matter how little or how much you use me, you change me every month.