Answer:
I am the only thing that always tells the truth. I show off everything that I see. I come in all shapes and sizes. What am I?
I have a neck but no head arms but no hands. What am I?
What is harder to catch the faster you run?
Everyone has me, but nobody can lose me. What am I?
I am heavy forward, but backward I'm not. What am I?
I go in hard, come out soft. Blow me hard and I'll make a pop. What am I?