I have 7 beautiful chickens, in the coop there is a place for a mud bath and they have logs in the corner, my hens and cockerel only dogs and scraps when I do a bit of gardening (flip and crumble the dirt) but is there any other ways to break there boredom? Thank you.
Hang a cabbage from a piece of string!
Seriously - they love it - my mother's hens dance and bounce when they have cabbage-on-string to play with.
Here's a random example on YouTube – disclaimer: I don't know these hens! :)
Chickens are social birds. Some farmers and animal scientists even say that even if you keep them in small cages the fact that they have "friends" makes them "happy" - not necessary my opinion.
For your question: Feed them from the ground. Plant some plants if you can. Create heights and shelter areas. Differ their food on a regular basis, i.e. feed safe leafy vegetables. You can even chase them around or spray them from time to time if they don't go crazy.