Pittsburgh Steelers defensive end Brett Keisel drives an off-road dump truck up the driveway towards the team dormitories as he arrives for the start of camp.
2 of 58Julio Cortez/AP
New York Giants quarterback Eli Manning runs warm up drills.
3 of 58Charlie Neibergall/AP
Adrian Peterson made news at the opening of camps with his thoughts on HGH testing.
4 of 58 (AP Photo/Mark Duncan)
Cleveland Browns linebacker Barkevious Mingo waits for the snap during training camp drills in Berea, Ohio.
5 of 58(AP Photo/Chuck Burton)
Carolina Panthers quarterback Cam Newton gives a fist-bump to Max Kalinowski, 6, of Spartanburg, S.C., during camp in Spartanburg.
6 of 58(AP Photo/Ted S. Warren)
Seattle Seahawks' Richard Sherman signs autographs, including copies of his photo on the cover of Sports Illustrated magazine, following a camp practice in Renton, Wash.
7 of 58(AP Photo/Ted S. Warren)
Injured Seattle Seahawks wide receiver Percy Harvin watches as other receivers go through practice drills. Harvin will get a second opinion on his sore hip next week in New York, and Seattle coach Pete Carroll says all options remain for how the injury is handled.
8 of 58(AP Photo/Mark Humphrey)
Tennessee Titans running back Chris Johnson (28) tries to put a ball into a waste can as running back Darius Reynaud (25) tries to block him out during a drill at camp in Nashville.
9 of 58Mark Humphrey/AP
Robert Johnson, Delanie Walker
Tennessee Titans strong safety Robert Johnson, left, and tight end Delanie Walker, center, work out with sledgehammers under the watch of assistant athletic trainer Don Moseley. Both players are on the injured reserve roster.
10 of 58Charlie Neibergall/AP
Minnesota Vikings defensive end Jared Allen hits a tackling dummy.
11 of 58(AP Photo/Bill Kostroun)
Geno Smith, Mark Sanchez
New York Jets quarterbacks Geno Smith (7) and Mark Sanchez (6) smile during training camp in Cortland, N.Y.
12 of 58 (AP Photo/Charlie Neibergall)
Minnesota Vikings linebacker Chad Greenway reacts as he runs a drill in Mankato, Minn.
13 of 58Icon/SMI
Bears guard Kyle Long of the Chicago Bears stretches while participating in camp.
14 of 58(AP Photo/Duane Burleson)
Dominic Raiola, Matthew Stafford
Detroit Lions quarterback Matthew Stafford, right, stretches with center Dominic Raiola in Allen Park, Mich.
15 of 58 (AP Photo/Charlie Neibergall)
Minnesota Vikings running back Adrian Peterson looks to pick up a soccer ball during a training camp drill in Mankato, Minn.
16 of 58(AP Photo/Orlin Wagner)
Kansas City Chiefs punter Dustin Colquitt (2) leads teammates during warm ups in St. Joseph, Mo.
17 of 58Icon/SMI
Alshon Jeffery makes an off balance catch while participating in the Bears training camp.
18 of 58Al Behrman/AP
Cincinnati Bengals center Kyle Cook stretches during practice in Cincinnati.
19 of 58(AP Photo/Keith Srakocic)
Pittsburgh Steelers wide receiver Markus Wheaton makes a catch at the first practice in Latrobe, Pa..
20 of 58Jim Rogash/Getty Images
Tom Brady, Tim Tebow
The Patriots opened camp with the Aaron Hernandez case on everyone's mind and the addition of Tim Tebow to deal with too.
21 of 58Steve Helber/AP
Robert Griffin III
Washington Redskins quarterback Robert Griffin III adjusts his knee brace during training camp at the team's new practice facility in Richmond, Va.
22 of 58Jack Dempsey/AP
Denver quarterback Peyton Manning takes a snap from center Manny Ramirez during training camp in Englewood, Colo.
23 of 58Gus Ruelas/AP
Tony Romo, Dez Bryant
Dallas Cowboys quarterback Tony Romo (9) and wide receiver Dez Bryant discuss a play
24 of 58Nam Y. Huh/AP
The Bears and quarterback Jay Cutler get to play for a new coach this season, Marc Trestman.
25 of 58Carlos Osorio/AP
The former USC star begins anew with his third NFL team, hoping to lead the Detroit Lions to the playoffs.
26 of 58(AP Photo/Julio Cortez)
Trumaine McBride, Tyler Sash
New York Giants cornerback Trumaine McBride, left, and safety Tyler Sash cool off at camp in East Rutherford, N.J.
27 of 58Bob Levey/Getty Images
The Texans are waiting patiently for new acquisition Ed Reed to get the green light to return from hip surgery.
28 of 58John Raoux/AP
Jacksonville running back Maurice Jones-Drew walks off the field with his two-year-old son, Madden.
29 of 58Lynne Sladky/AP
Miami Dolphins quarterback Ryan Tannehill gives a high-five to a jumping Casey Rizzi, 7, of Davie, Fla., after practice.
30 of 58Orlin Wagner/AP
Kansas City Chiefs
Kansas City Chiefs running backs work out during Chiefs training camp in St. Joseph, Mo.
31 of 58Mike Carlson/AP
The Bucs are expecting big things out of their major offseason acquisition, Darrelle Revis. MUST WATCH VIDEO: Super Bowl champion Amani Toomer and SNY/WFAN on-air personality Marc Malusis discuss Darrelle Revis' recent knee surgery and if he will we be the same as was before his injury.
32 of 58Gary Bogdon/SI
If the shoe fits, wear it.
33 of 58Lynne Sladky/AP
Ryan Tannehill talks with his wife, Lauren, after a Dolphins practice.
34 of 58Gary Bogdon/SI
Miami has its share of fanatics at camp this year.
35 of 58Jim Rogash/Getty Images
In addition to his quarterback reps as camp opened, Tebow also caught passes and lined up with receivers and backs in other drills.
36 of 58Jim Rogash/Getty Images
When asked where Tim Tebow might line up, Bill Belichick told reporters, "I think we'll use Tim where ever we feel like is best for the team. I know that's what he's committed to doing as well, whatever that is."
37 of 58Jim Rogash/Getty Images
Levelle Hawkins completes a passing drill during the first day of camp.
38 of 58Mike Carlson/AP
Tampa Bay Buccaneers' Mike Williams signs autographs for fans.
39 of 58Matt Rourke/AP
Philadelphia Eagles rookie DT Bennie Logan cools off during a training session. MUST WATCH VIDEO: Super Bowl champion Amani Toomer and SNY/WFAN on-air personality Marc Malusis discuss the quarterback competition in Philadelphia and why Matt Barkley will not come out on top.
40 of 58Matt Rourke/AP
Philadelphia Eagles wide receiver Ifeanyi Momah catches a tethered ball.
41 of 58Lynne Sladky/AP
Miami Dolphins wide receiver Mike Wallace signs autographs for fans.
42 of 58(AP Photo/Nam Y. Huh)
Chicago Bears long snapper Patrick Mannelly hikes the ball during training camp at Olivet Nazarene University in Bourbonnais, Ill.
43 of 58Gus Ruelas/AP
Monte Kiffin, Bruce Carter
Dallas Cowboys linebacker Bruce Carter talks with Defensive Coordinator Monte Kiffin.
44 of 58Steve Helber/AP
Robert Griffin III
Griffin III signs autographs for fans after a Redskins practice.
45 of 58Steve Helber/AP
Robert Griffin III
Griffin III walks off the field with fan Michael Dabney, 7, of Richmond.
46 of 58John Bazemore/AP
Atlanta Falcons defensive back and first round draft pick Desmond Trufant arrives for training camp in Flowery Branch, Ga. Trufant signed his contract with the Falcons shortly before reporting to camp.
47 of 58Nam Y. Huh/AP
Chicago Bears rookie Kyle Long arrives for training camp in Bourbonnais, Ill.
48 of 58Gus Ruelas/AP
Bruce Carter, Sean Lee
Dallas Cowboys linebackers Bruce Carter (left) and Sean Lee talk while they stretch during Cowboys training camp in Oxnard, Calif.
49 of 58Gus Ruelas/AP
Dallas Cowbows linebacker DeMarcus Ware prepares to get past the offensive linemen as they run plays without pads.
50 of 58Gus Ruelas/AP
Dallas Cowboys wide receiver Dez Bryant jogs back to the huddle after running a pass pattern.
51 of 58Lynne Sladky/AP
Miami Dolphins cornerback Will Davis interacts with fans after practice at training camp in Davie, Fla.
52 of 58James D. Smith/Dallas Cowboys/SI
Tony Romo expects to have more input in playcalling this season.
53 of 58Gary Bogdon/SI
The Dolpins were among the first teams to begin camp this year.
54 of 58Mike Carlson/AP
Tampa Bay Buccaneers cornerback Johnthan Banks (right) covers wide receiver Chris Owusu during camp.
55 of 58Patrick Semansky/AP
New Ravens linebacker Elvis Dumervil pauses before joining teammates for training camp at the team's practice facility in Owings Mills, Md.
56 of 58Mike Carlson/AP
Tampa Bay quarterback Josh Freeman gets a play from offensive coordinator Mike Sullivan.
57 of 58Pat Sullivan/AP
Brennan Williams, Bryan Braman
Houston Texans Brennan Williams (73) and Bryan Braman (50) square off during a drill.
58 of 58 (AP Photo/Al Behrman)
Cincinnati Bengals tight end Jermaine Gresham takes a drink while stretching at the close of practice in Cincinnati.
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