Answer:
I am heavy forward, but backward I'm not. 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?
I am an object which is used in baseball. During the day I can't be seen at all. What am I?
What has no beginning, end, or middle?
Find me on body builders or in the drink aisle. What am I?
I always murmur but never talk. Always run but never walk. I have a bed but never sleep, have a mouth but never speak. What am I?