Our Sammy (Sheltie) is high energy but instead of trying to tire him out w exercise I did the opposite and it worked well. We have a "bachelor pen" of chain link fencing, 4' high, next to the chicken run and I'd put him there for an hour or two every afternoon. This accomplished two things: conditioned him to be near the chickens and not bother them (because he couldn't) and lay down and be bored, bc there was nothing else to do. He thus learned to ignore the birds. If the chickens might fly over, trimming the feathers of one wing should take care of that. I used a properly fitted prong collar on him the day I turned the chickens out to free range and he did fine. This may or may not work for you, but I can now trust Sammy to run as free as the birds. They are nothing but lawn furniture to him.
ETA there were no chickens in the bachelor pen when I put Sammy in there.