A jungle gym would be a great idea. During the winter my chickens choose not to go outside. I occasionally have thought about some kind of chicken sized treadmill with some kind of treat at the front to keep them busy.
If you are looking for something to entertain them, I hang a bird seed block for them to peck at. They only last a couple days, but it is something to help break up the day.
If you are looking for something to entertain them, I hang a bird seed block for them to peck at. They only last a couple days, but it is something to help break up the day.