Answer:
When I'm born I fly. When I'm alive I lay. When I'm dead I run.
Gets rid of bad ones, short and tall. Tightens when used, one size fits all.
At first I am a yellow weed in the lawn, and then the wind blows, and my white feathers are gone. What am I?
What contains zero calories, but if you consume it, you will probably gain weight?
Whoever makes it, tells it not. Whoever takes it, knows it not. And whoever knows it wants it not
I can only be played on a windy day