Answer:
Find me on body builders or in the drink aisle. What am I?
I am needed for most animals and hardcover books
Two bodies have I, though both joined in one. The more I stand still the faster I run. What am I?
I am one with eight to spare, lest I lose my one. I'm not a number. What am I?
Flat as a leaf, round as a ring; have two eyes, can't see a thing. What am I?
It can be cracked, It can be made, It can be told, it can be played. What is it?