Answer:
I am there when you sit, but gone when you stand. What am I?
I am an instrument capable of making numerous sound but cannot be touched or seen.
I run smoother than any rhyme, I love to fall but cannot climb. What am I?
Only one color, but not one size, stuck at the bottom, yet easily flies. Present in sun, but not in rain, doing no harm, and feeling no pain. What am I?
You kick me, you punch me, and you beat me up all class. When you leave, you don't even say thanks for allowing you to beat me up. What am I?
Brings the sky a lot closer.