Answer:
What flies without wings?
What I am filled, I can point the way. When I am empty. Nothing moves me. I have two skins. One without and one within.
Weight in my belly, Trees on my back, I travel fast in my place, but feet is a feature I lack
I never was but always will be. No one ever saw me but everyone knows I exist. I give people the motivation to better themselves every day. What am I?
Whiling away the hours of flowers, Walking through fields of gold. Preening and pruning in lights fading hours, For petals to freeze in the cold. What is it?
You use it between your head and your toes, the more it works the thinner it grows.