In my opinion, boys and girls need lots of fresh air and outdoor play to turn out well.
The little folks usually want to go out. Sometimes I have to make the big ones go out, but they have a good time once they get out there!
I have a friend who said that when she was a kid, her mother locked the door after the kids went out in the morning so they couldn't get back in. She always claimed to have just washed the floor!