Answer:
You throw me out when you want to use me and you take me in when you don't want to use me. Who am I?
Runs smoother than any rhyme, loves to fall but cannot climb.
What type of paper can you neither read nor write on?
My first master has four legs, my second master has two. My first I serve in life, my second I serve in death. Tough I am, yet soft beside. Against ladies cheeks I often reside.
I love to dance and twist and prance. I shake my tail, as away I sail. Wingless I fly into the sky.
Special abilities and brightly colored underwear are all you need to be one of these.