CAPTION: Oct 25, 2009; Pittsburgh, PA, USA; Minnesota Vikings running back Adrian Peterson runs the ball against the Pittsburgh Steelers during the second half of the game at Heinz...

3. Adrian Peterson, Oklahoma football

Oklahoma running back Adrian Peterson (28) runs for a touchdown against Oklahoma State during the fourth quarter Saturday, Nov. 26, 2005...

MINNEAPOLIS, MN - DECEMBER 13: Adrian Peterson #28 of the Minnesota Vikings runs the ball against the Cincinnati Bengals on December 13, 2009...

CAPTION: Oct 25, 2009; Pittsburgh, PA, USA; Minnesota Vikings running back Adrian Peterson runs the ball against the Pittsburgh Steelers during the second half of the game at Heinz...

MINNEAPOLIS - NOVEMBER 22: Adrian Peterson #28 of the Minnesota Vikings rushes against the Seattle Seahawks at Hubert H. Humphrey Metrodome on...

Minnesota Vikings running back Adrian Peterson, center, stopped by Arizona Cardinals linebacker Karlos Dansby, left, during the first half of an NFL...

PITTSBURGH, PA - OCTOBER 25: Adrian Peterson #28 of the Minnesota Vikings runs over William Gay #22 of the Pittsburgh Steelers at Heinz...

Minnesota Vikings running back Adrian Peterson, left, runs into Atlanta Falcons linebackers Curtis Lofton (50) and Coy Wire on a seven-yard...

Nov 29, 2009; Minneapolis, MN, USA; Minnesota Vikings running back Adrian Peterson (28) rushes against the Chicago Bears in the third quarter at the Metrodome. Vikings win 36...

Adrian Peterson

Minnesota Vikings running back Adrian Peterson, center, stopped by Arizona Cardinals linebacker Karlos Dansby, left, during the first half of an NFL...

MINNEAPOLIS - NOVEMBER 22: Adrian Peterson #28 of the Minnesota Vikings rushes against the Seattle Seahawks at Hubert H. Humphrey Metrodome on...

CAPTION: Nov 29, 2009; Minneapolis, MN, USA; Minnesota Vikings running back Adrian Peterson (28) rushes against the Chicago Bears in the third quarter at the Metrodome. Vikings win 36...

Minnesota Vikings running back Adrian Peterson (28) fumbles the ball

MINNEAPOLIS, MN - NOVEMBER 29: Running back Adrian Peterson #28 of the Minnesota Vikings reaches for the football as linebacker Hunter Hillenmeyer #92 of the...