Answer:
The faster you run the harder it is to catch me
I can only be played on a windy day
I may seem real but it always turns out I was never there in the first place... you only see me during a certain resting stage.
What can fill a room but takes up no space?
I am what one cannot keep, two cannot hold, and three cannot destroy. What am I?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?