Preparation is something significant in football. Both the Denver Broncos and the New England Patriots know that well and have done it for weeks before the two AFC powerhouses meet each other in the conference final on Sunday.
You hear about Peyton Manning's cold-weather struggles here and there. Manning, the only player in history to have won the league MVP award four times and who will likely earn his fifth in a couple of weeks, has been 4-7 when the temperature at kickoff is under 32 F (0 C).
One of the reasons he has struggled in cold weather is he wears a glove on his throwing hand. That affects his grip on the ball, zip of the ball, and touch on his passes.