Denver Broncos quarterback Peyton Manning during Sunday's Super Bowl. Some players on the Seattle Seahawks say they studied his hand signals. That helped them shut down the Broncos defense, they say. Kevin C. Cox/Getty Images hide caption

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Peyton Manning during the news conference Wednesday in Indianapolis when it was announced that he's leaving the NFL's Colts. Joey Foley/Getty Images hide caption

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New York Giants quarterback Eli Manning holds the Vince Lombardi Trophy after the NFL Super Bowl XLVI game against the New England Patriots, Sunday (Feb. 5, 2012). Charlie Riedel/AP hide caption

itoggle caption Charlie Riedel/AP