Answer:
Plow and hoe, reap and sow, What soon does every farmer grow?
You can spin, wheel and twist, but this thing can turn without moving. What is it?
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.
I do not breathe, but I run and jump. I do not eat, but I swim and stretch. I do not drink, but I sleep and stand. I do not think, but I grow and play. I do not see, but you see me everyday.
Through its wounds, water does run. It once held many but now has none. What is it?
You use it between your head and your toes, the more it works the thinner it grows.