My five chicks are nearing three weeks old, and about half feathered. They are getting quite rambunctious in the brooder, and now they all fly out to me when I open it. The only exercise they get is climbing on me, so I want them to run around outside soon. I'm unsure how to go about this. I just started them on medicated feed, and have been giving them some sand for grit. It's pretty cool and windy in Indiana these days though, so I'm sure they can't be out for long. I'm thinking the best plan might be using a big box with an open bottom so the walls would block the wind?