Philadelphia safety Jaiquawn Jarrett, left, defends against tight end Martell Webb as he attempts to catch a pass on Thursday at Eagles training camp at Lehigh University.

Carolina running back DeAngelo Williams gets his work in at Panthers training camp on Thursday in Spartanburg, SC.

With bantamweight Dominick Cruz's UFC championship belt over his shoulder, Eagles quarterback Michael Vick engages the media Thursday at training camp at Lehigh University.

Vikings defensive end Jared Allen signs autographs after a tough day of training camp Thursday in Mankato, Minn.

Texans guard Shelley Smith sprays water on his head to cool down from Thursday's hot weather in Houston.

Texans defensive end Jesse Nading sits on a cooler after one of many hot-weather workouts taking place across the country Thursday.

Browns wideout Chris Matthews makes a catch during a training camp session on Thursday ... and narrowly avoids knocking a few teeth loose in the process.

Browns quarterback Colt McCoy hands the ball off to running back Peyton Hillis during a training camp session on Thursday.

Eagles kicker Alex Henery works on his accuracy with holder Chas Henry on Thursday at Lehigh University.

Eagles running back LeSean McCoy warms up during training camp on Thursday at Lehigh University. McCoy rushed for more than 1,000 yards last season, and he's got help in the backfield this year with Ronnie Brown joining Philadelphia.
 

NFL commissioner Roger Goodell speaks to fans of the Carolina Panthers during training camp Wednesday at Wofford College in Spartanburg, SC.

Cincinnati Bengals cornerback Leon Hall gets in front of halfback Jay Finley (33) to break up a pass attempt during practice Tuesday in Georgetown, Ky.

Arizona Cardinals' Rob Housler, left, and Mike Leach run drills during training camp Tuesday in Flagstaff.

 Chicago Bears quarterback Jay Cutler looks to a throw during training camp.

Pittsburgh Steelers wide receiver Arnaz Battle (81) dives for a pass in the end zone in front of cornerback Bryant McFadden (20) during NFL football training camp.
 

New York Jets quarterback Mark Sanchez stretches at the beginning of practice on Tuesday.

Minnesota Vikings wide receiver Percy Harvin (12) carries the ball during a kick return drill.

New England Patriots owner Robert Kraft (back left) watches his team practice with former player Tedy Bruschi.

Wide receiver Plaxico Burress signs autographs for New York Jets fans at the end of practice.

Cleveland Browns wide receivers Mohamed Massaquoi (left) and Joshua Cribbs ride stationary bikes during practice.

Quarterback Alex Smith (right) walks around the 49ers' football training facility in Santa Clara, Calif. on Tuesday. Smith, who signed a one-year free agent contract last week, plans to return to workouts with the team Thursday.

The newest members of the Patriots Albert Haynesworth (left) and Chad Ochocinco were both on the practice field on Tuesday.

Houston Texans players run to a practice field during camp on Tuesday.

New York Jets head coach Rex Ryan looks down at his new tattoo while addressing the media on Tuesday at Atlantic Health Training Center in Florham Park, N.J.

Detroit Lions punter Nick Harris shows off his ability during practice in Allen Park, Mich., on Tuesday.

Detroit Lions receiver Rashied Davis (right) watches as teammate Stefan Logan walks on his hands during a break in practice on Tuesday.

Minnesota's Jonathan Gilmore (left), Seth Olson, Allen Reisner, Emmanuel Arceneaux and Jaymar Johnson charge ahead as defenders during a kick return drill at training camp on Tuesday in Mankato, Minn.
 

Carolina's Steve Smith (right) breaks the tackle by Charles Godfrey during practice in Spartanburg, S.C. on Tuesday.

The New York Jets' Nick Mangold (center) gets ready to snap the ball during a drill on Tuesday.

Cleveland punter Reggie Hodges gets medical attention after injuring his left leg during punting drills at the Browns' training facility as kicker Phil Dawson (4) and tight end Evan Moore (89).

Texans cornerback Sherrick McManis (left) knocks the ball away from wide receiver Trindon Holliday during practice on Tuesday at Reliant Park in Houston.

Arizona's Larry Fitzgerald (right) runs with the ball after making a catch in front of A.J. Jefferson during camp on Monday in Flagstaff, Ariz.
 

Indianapolis Colts running back Donald Brown runs with the ball at training camp at Anderson University.

San Diego Chargers running back Jordan Todman and safety Steve Gregory during drills at training camp at Chargers Park.

New York Jets QB Mark Sanchez hands off to Shonn Greene during training camp at the Jets training facility.

Dallas Cowboys' Jeff Moturi, left, and Mike Jenkins go through drills during NFL football training camp in San Antonio.
 

Houston Texans' Mario Williams cools off during the first day of their NFL football training camp.

Philadelphia Eagles wide receiver Gerald Jones makes a catch in front of cornerback Curtis Marsh during the morning session of training camp.

Denver Broncos quarterback Tim Tebow throws during training camp at the Denver Broncos football training facility in Englewood, Colo.

Denver Broncos running back Knowshon Moreno catches a pass during training camp at the Denver Broncos football training facility in Englewood, Colo.

Outside linebacker Mario Williams hits the tackling dummy during practice on the first day of training camp.

Wide receiver Jeff Maehl completes a pass in front off cornerback Roc Carmichael during practice on the first day of training camp for the Houston Texans.

Nate Burleson goes through the days passing drills at the Lions training facility.

Cleveland receiver Brian Robiskie, left, catches a pass against safety T.J. Ward at the Browns training camp in Berea, Ohio on Sunday.

Philadelphia CB Nnamdi Asomugha, second from right, watches practice from the sidelines with new teammate Jamar Adams (45) during the morning session of NFL training camp at Lehigh University in Bethlehem, Pa., on Sunday.
 

Oakland defensive end Richard Seymour, left, and defensive tackle Tommy Kelly take part in drills.

Tennessee receiver O. J. Murdock reaches for a pass around a goal post pad during a drill on Saturday in Nashville, Tenn.

Chicago's Matt Toeaina stretches with teammates.

Dallas quarterback Tony Romo hands off to running back Tashard Choice.

Kansas City receiver Dexter McCluster (22) and fullback Shane Bannon (40) go through drills.

Pittsburgh linebacker James Harrison, right, gives a hug to safety Troy Polamalu.

Green Bay's Aaron Rodgers, left, hugs teammate Greg Jennings.

Green Bay's Diondre Borel rides a small bike with a fan.

Jacksonville defensive tackle Tyson Alualu (left) strips the football from teammate Aaron Kampan.

Arizona's Larry Fitzgerald (11) runs for a score after making a catch as teammates Paris Lenon (51), Jim Dray (81) and Beanie Wells (26) follow.

Arizona's Andre Roberts (12) makes a catch over Greg Toler (28) on Saturday.

Philadelphia's DeAndre Brown dives for a pass as DB Isaiah Trufant (41) defends.

San Diego coach Norv Turner chats with running back Ryan Mathews.

Philadelphia quarterback Vince Young joins his new teammates.

Indianapolis rookie Delone Carter talks with reporters at training camp in Anderson, Ind. on Sunday.
 

New England Tom Brady gears up for the season.

Cleveland running back Peyton Hillis sharpens his skills on Sunday.

New York quarterback Eli Manning (10) calls out the signals.

Miami receiver Brandon Marshall (19) stretches in very warm Davie, Fla.

Indianapolis quarterback Peyton Manning signs autographs on Sunday.

Cleveland defensive end Jabaal Sheard hits a blocking sled.
 

New England defensive lineman Albert Haynesworth (92) walks off the field with defensive linemen Landon Cohen (66) and Ron Brace (97) on Sunday.

New England tight end Aaron Hernandez wipes his brow while signing autographs on Sunday.

Tennessee Titans offensive tackle Michael Roos (71) stretches during NFL football training camp on Tuesday, Aug. 2, 2011, in Nashville, Tenn. Roos has started every game since being drafted in the second round in 2005, and is expected to start again on an offensive line that returns intact from 2010.