Answer:
Thirty white horses on a red hill, first they champ, then they stamp, then they stand still.
You can spin, wheel and twist. But this thing can turn without moving.
I work when I play and play when I work.
We are five little objects of an everyday sort, You will find us all in a tennis court.
What stays on the ground but never gets dirty?
I go in hard, come out soft. Blow me hard and I'll make a pop. What am I?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?