NFL training camps - Behind-the-scenes access

Arizona Cardinals fans watch during an NFL football training camp, Tuesday, July 29, 2014, in Glendale, Ariz. (AP Photo/Matt York)

St. Louis Rams defensive end Michael Sam speaks to the media following practice at the NFL football team's training camp facility Tuesday, July 29, 2014, in St. Louis. (AP Photo/Jeff Roberson)

Chicago Bears guard Kyle Long (75) leaves the field after NFL football training camp at Olivet Nazarene University, Wednesday, July 30, 2014, in Bourbonnais, Ill. (AP Photo/Nam Y. Huh)

Miami Dolphins cornerback Will Davis (29) prepares to catch a pass during NFL football training camp in Davie, Fla., Wednesday, July 30, 2014. (AP Photo/Alan Diaz)

Miami Dolphins running back Lamar Miller (26) talks to quarterback Ryan Tannehill (17) during NFL football training camp in Davie, Fla., Wednesday, July 30, 2014. (AP Photo/Alan Diaz)

Chicago Bears wide receiver Eric Weems (14), right, works with cornerback Charles Tillman (33) during NFL football training camp at Olivet Nazarene University, Wednesday, July 30, 2014, in Bourbonnais, Ill. (AP Photo/Nam Y. Huh)

Miami Dolphins running back Damien Williams (5) laughs during NFL football training camp in Davie, Fla., Wednesday, July 30, 2014. (AP Photo/Alan Diaz)

Green Bay Packers’ DuJuan Harris hugs a fan before NFL football training camp Monday, July 28, 2014, in Green Bay, Wis. (AP Photo/Morry Gash)

Carolina Panthers coach Ron Rivera, left, and the team are reflected in DeAngelo William's helmet during an NFL football practice at NFL football training camp in Spartanburg, S.C., Saturday, July 26, 2014. (AP Photo/Chuck Burton)

Green Bay Packers’ Aaron Rodgers tries to block the lens as he arrives for NFL football training camp Monday, July 28, 2014, in Green Bay, Wis. (AP Photo/Morry Gash)

Green Bay Packers’ Charles Clay stretches during NFL football training camp Monday, July 28, 2014, in Green Bay, Wis. (AP Photo/Morry Gash)

Green Bay Packers players ride bikes to NFL football training camp Monday, July 28, 2014, in Green Bay, Wis. (AP Photo/Morry Gash)

Carolina Panthers' Josh Thomas, left, reaches out to hug his son, Dallas, 2, right, after an NFL football practice at their training camp in Spartanburg, S.C., Tuesday, July 29, 2014. (AP Photo/Chuck Burton)

Minnesota Vikings players stretch on the field during an NFL football training camp practice, Monday, July 28, 2014, in Mankato, Minn. (AP Photo/Charlie Neibergall)

PGA golfer Bubba Watson holds his son Caleb who gives New Orleans Saints tight end Jimmy Graham (80) a high-five during an NFL football training camp in White Sulphur Springs, W.Va., Saturday, July 26, 2014. (AP Photo/Chris Tilley)

Kansas City Chiefs wide receiver Kyle Williams (19) grabs a pass during a drill at an NFL football training camp Monday, July 28, 2014, on the Missouri Western State University campus in St. Joseph, Mo. (AP Photo/The St. Joseph News-Press, Todd Weddle)

Pittsburgh Steelers center Chris Elkins, left, works on defensive tackle Hebron Fangupo (92) during a blocking drill in practice at NFL football training camp in Latrobe, Pa., on Monday, July 28, 2014 . (AP Photo/Keith Srakocic)

Tennessee Titans wide receiver Marc Mariani, right, can't hang onto a pass as he is defended by cornerback Marc Anthony, left, during NFL football training camp Sunday, July 27, 2014, in Nashville, Tenn. (AP Photo/Mark Humphrey)

Houston Texans running back Arian Foster laughs during NFL football training camp Monday, July 28, 2014, in Houston. (AP Photo/Pat Sullivan)

Carolina Panthers' Cam Newton reacts after completing a long pass during an NFL football practice at their training camp in Spartanburg, S.C., Monday, July 28, 2014. (AP Photo/Chuck Burton)

Tennessee Titans defensive back Tommie Campbell runs a drill with a training device on his ankles during NFL football training camp Sunday, July 27, 2014, in Nashville, Tenn. (AP Photo/Mark Humphrey)

Pittsburgh Steelers defensive back Ross Ventrone (35) leaps for a ball during special teams drills during practice at NFL football training camp in Latrobe, Pa., Sunday, July 27, 2014. (AP Photo/Keith Srakocic)

A member of the Carolina Panthers film crew tries to bat away a field goal-attempt during an NFL football practice at their training camp in Spartanburg, S.C., Sunday, July 27, 2014. (AP Photo/Chuck Burton)

Kansas City Chiefs quarterbacks Aaron Murray (7), Chase Daniel (10) and Alex Smith (11) watch a drill at NFL football training camp Sunday, July 27, 2014, in St. Joseph, Mo. (AP Photo/Charlie Riedel)

Kansas City Chiefs linebacker Justin Houston (50) participates in a drill during NFL footballtraining camp Sunday, July 27, 2014, in St. Joseph, Mo. (AP Photo/Charlie Riedel)

New Orleans Saints wide receiver Charles Hawkins (18) catches the ball over defensive back Trevin Wade (30) during NFL football training camp in White Sulphur Springs, W. Va., Sunday, July 27, 2014. (AP Photo/Chris Tilley)

Houston Texans' Jadeveon Clowney, second from right, talks with teammate Duane Brown, right, as they sign autographs for fans after an NFL football training camp practice Sunday, July 27, 2014, in Houston. (AP Photo/David J. Phillip)

New England Patriots quarterback Tom Brady, right, smiles while working out on the field during an NFL football training camp practice at Gillette Stadium, Sunday, July 27, 2014, in Foxborough, Mass. (AP Photo/Steven Senne)

Minnesota Vikings running back Adrian Peterson, second from left, walks off the field following an NFL football training camp practice, Sunday, July 27, 2014, in Mankato, Minn. (AP Photo/Charlie Neibergall)

Carolina Panthers' Cam Newton (1) throws a pass during an NFL football practice at their training camp in Spartanburg, S.C., Saturday, July 26, 2014. (AP Photo/Chuck Burton)

Pittsburgh Steelers tight end Heath Miller works on a blocking sled during the first practice at their NFL football training camp in Latrobe, Pa., Saturday, July 26, 2014. (AP Photo)

St. Louis Rams' Greg Robinson, left, pushes tackle Sean Hooey (64) in a sand pit during training camp at the NFL football team's practice facility on Saturday, July 26, 2014, in St. Louis. (AP Photo/Jeff Roberson)

Cleveland Browns tight end Jordan Cameron makes a catch during NFL football training camp, Saturday, July 26, 2014, in Berea, Ohio. (AP Photo/Mark Duncan)

San Diego Chargers rookie wide receiver Brelan Chancellor, left, bobbles and drops a pass as cornerback Crezdon Butler defends at an NFL football training camp Friday, July 25, 2014, in San Diego. (AP Photo)