Answer:
What do you throw out to use and take in when you're done?
Brown I am and much admired; many horses have I tried; tire a horse and worry a man; tell me this riddle if you can.
I cut through evil like a double edged sword, and chaos flees at my approach. Balance I single-handedly upraise, through battles fought with heart and mind, instead of with my gaze.
Flat as a leaf, round as a ring. Has two eyes, can't see a thing.
What lies in a tunnel of darkness. That can only attack when pulled back?
You use it between your head and your toes, the more it works the thinner it grows.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?