Answer:
I have two bodies joined together as one. When standing still I run and run.
I am gentle enough to soothe your skin, light enough to fly in the sky, strong enough to crack rocks. What am I?
I hold two meanings. With one I may be broken, with the other I hold on. What am I?
I am one with eight to spare, lest I lose my one. I'm not a number. What am I?
I spend the day at the window, go to the table for meals, and hide at night. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.