Washington Redskins running back Adrian Peterson (26) carries the ball during an NFL football game against the Tennessee Titans, Saturday, Dec. 22, 2018 in Nashville, TN. (Aaron Doster via AP)

Pittsburgh Steelers running back Le'Veon Bell (26) runs the football during an NFL football AFC divisional playoff game against the Jacksonville Jaguars, Sunday, Jan. 14, 2018, in Pittsburgh. The Jaguars defeated the Steelers, 45-42. (Ryan Kang via AP)

Atlanta Falcons Tevin Coleman #26 in action against the New England Patriots at Super Bowl 51 on Sunday, February 5, 2017 in Houston, TX. (AP Photo/Gregory Payan)

Oakland Raiders running back Marshawn Lynch (24) is tackled by Seattle Seahawks cornerback Shaquill Griffin (26) during the second half of an NFL football game at Wembley stadium in London, Sunday, Oct. 14, 2018. (AP Photo/Matt Dunham)

Minnesota Vikings running back Latavius Murray (25) runs from Chicago Bears defensive back Deon Bush, left, during the second half of an NFL football game, Sunday, Dec. 30, 2018, in Minneapolis. (AP Photo/Bruce Kluckhohn)

Philadelphia Eagles running back Jay Ajayi (26) carries the ball during a preseason NFL football game against the New England Patriots on Thursday, Aug. 16, 2018 in Foxborough, Mass. New England won 37-20. (Aaron M. Sprecher via AP)

New Orleans Saints running back Mark Ingram (22) rushes against the Detroit Lions during an NFL football game at Ford Field in Detroit, Sunday, Oct. 19, 2014. (AP Photo/Rick Osentoski)

Kansas City Chiefs running back Spencer Ware (32) carries the ball during an NFL football game against the Baltimore Ravens on Sunday, Dec. 9, 2018 in Kansas City, Mo. (Ben Liebenberg via AP)

Los Angeles Rams running back C.J. Anderson scores against the Dallas Cowboys during the first half in an NFL divisional football playoff game Saturday, Jan. 12, 2019, in Los Angeles. (AP Photo/Marcio Jose Sanchez)

Miami Dolphins running back Frank Gore (21) runs the ball, during the first half of an NFL football game against the New England Patriots, Sunday, Dec. 9, 2018, in Miami Gardens, Fla. (AP Photo/Lynne Sladky)