Mine seem to really enjoy flying, esp those polish cross chicks - I am thinking their light bodies and nice large wings make it really easy for them.While body shape helps, many chickens are only prevented from flying great heights by their own will. They just don't want to fortunately.
Even the older girls like Blanche will take flight and fly up about 4’ easily. Funnily enough Mr P rarely flies up on things now. He would rather stay with his ladies Marty and Penelope who can’t fly at all. They both plummet to the ground real well though!