Former Iowa State running back David Montgomery is getting used to a new coach and new system with the Chicago Bears.
Matt Eberflus takes over a Bears team that finished 6-11 last season.
Montgomery is working with his third different position coach in as many years.
Montgomery is coming off a season in which he rushed for nearly 850 yards and seven touchdowns. He is entering the final year of his contract.
Montgomery says he is not about proving anybody wrong but about proving himself right.