Answer:
Weight in my belly, trees on my back, nails in my ribs, feet I do lack. What am I?
I only exist when you are here. Where you never were I can never be.
I am an instrument capable of making numerous sounds but cannot be touched or seen. What am I?
I am always coming but I never arrive. What am I?
I'm not really more than holes tied to more holes; I'm strong as good steel, though not as stiff as a pole.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?