Answer:
I have feathers that help me fly; with head and body but I'm not alive. Very skinny and a fixed length how far I go depends on your strength.
You use me from your head to your toes. The more I work, the thinner I grow. What am I?
I am round. I have only one line. Circle is not my name indeed. What am I?
I am used to bat with, yet I never get a hit. I am near a ball, yet never thrown. What am I?
I flow from the Homerβs mouth when he sees doughnuts.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.