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As strange as it sounds, this one might be a bit tough for Manning.
Manning was essentially the offensive coordinator for the Colts. He called a lot of the plays, he mixed stuff up at the line of scrimmage and provided most of the direction for the offense—but that offense was much different than the one they have in Denver.
Rarely did the Colts run the ball and when they did, it was more to set up Manning's impeccable play-action passing game.
In Indianapolis, the running game was used to provide some unpredictability rather than to actually generate serious yardage.
It's completely different in Denver. The Broncos had the best running game in the league last year, rushing for almost 165 yards per game. While some of that can be attributed to the unorthodox offense that Tim Tebow played under, there's no denying that Denver has the personnel to run the ball and to run the ball well.
It would actually be more beneficial for Peyton to do less for the Broncos than he ever did for the Colts. It's something that he'll have to adjust to, but if he's able to run a good mix of rushing and passing plays, the Broncos will be an enormously difficult team to defend.