I put in a chicken swing in my coop and today encouraged my 4 month old barred rock to hop up. She seemed to love it. Moved the swing by bobbing her tail up and down.  Maybe she was trying to balance, but think if she didn't like it, she would have hopped off.
 
Will have to move it because it was above a roost and the other hens were in the way and not happy. The swing took up about 2' swinging from side to side. I think I will put it in the run which is larger and 6' tall. Need some larger branches or trunks.
 
What fun!