Answer:
As light as a feather, but you can’t hold it for ten minutes.
It can pierce the best armor and make swords crumble with a rub, yet for all its power It can't harm a wooden club.
They try to beat me, they try in vain. And when I win, I end the pain.
What stays on the ground but never gets dirty?
Don't do this in the shallow end.
People take me on walks and I run and have fun. What am I?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?