Answer:
Two bodies have I, though both joined in one. The more I stand still the faster I run. What am I?
Canine children.
I am black and white. I have strings I have keys. I make sound without my lips. I make dough with no flour
After you go through a fall, I will take over. All life will stall, or at least grow slower. What am I?
I love spinach.
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.