Answer:
Long and slinky like a trout, never sings till it's guts come out.
What is made of wood but can't be sawed?
Always old, sometimes new. Never sad, sometimes blue. Never empty, sometimes full. Never pushes, always pulls.
I can move even when you are still. I can be one or many.
When I'm born I fly. When I'm alive I lay. When I'm dead I run.
What sphinxes employ and players enjoy.