Answer:
You use it between your head and your toes, the more it works the thinner it grows.
What do you throw out to use and take in when you're done?
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?
I run through hills. I veer around mountains. I leap over rivers. And crawl through the forests. Step out your door to find me.
What gets closer when you blink?
Iām grown from darkness but shine with a pale light. Very round I am and always a lady's delight.