When the wind picks up, and a chick is feeling particularly frisky, they'll start to flap their wings. Maybe they will dance a little. I take this as an indication that they are ready to RUN!!!!
We encourage this by running with our wing (well, we only have one wing, afterall) out. I love it when they run: building their flight muscles. It won't be long before they have feathers, so they'll be able to catch the wind and fly. Nacho is already growing in his wing feathers. I wish I could show you a picture of how awkward he looks. Soon. I promise.