Answer:
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.
You heart it speak, for it has a hard tongue. But it cannot breathe, for it has not a lung.
I have one eye. See near and far. I hold the moments you treasure and the things that make you weep.
Brown I am and much admired; many horses have I tried; tire a horse and worry a man; tell me this riddle if you can.
My sides are firmly laced about, Yet nothing is within; You'll think my head is strange indeed, Being nothing else but skin.
People take me on walks and I run and have fun. What am I?