Answer:
Who is it that rows quickly with four oars, but never comes out from under his own roof?
Come up and let us go. Go down and here we stay
I turn around once. What is out will not get in. I turn around again. What is in will not get out.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.
With head without hair. With mouth without tooth.
People take me on walks and I run and have fun. What am I?