Answer:
I am quick when I'm thin. I am slow when I'm fat. Wind is my worst nightmare. What am I?
Weight in my belly, trees on my back, nails in my ribs, feet I do lack. What am I?
I hide but my head is outside. What am I?
The faster you run the harder it is to catch me
I am Invisible Man's drink at snack time
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic