Bob Peterson/The LIFE Images Collection/Getty Images
Redskins quarterback Sonny Jurgensen (9) and teammates listen to head coach Vince Lombardi at R.F.K. Memorial Stadium.
1969
AP
Jets head coach Weeb Ewbank pokes the stomach of Dave Foley on the first day of training camp at Hofstra University in Hempstead, N.Y.
1972
AP
Quarterback Joe Namath demonstrates his throwing form at the Jets' training camp at Hofstra University in Hempstead, N.Y.
1973
Walter Iooss Jr. for Sports Illustrated
Steelers running back Franco Harris signs autographs for young fans after training camp at St. Vincent College in Latrobe, Penn.
1974
Barry Staver/Denver Post via Getty Images
Defending is Bill Thompson's business, as he sharpens his skills from his right cornerback position for the Broncos.
1978
AP
The Dolphins begin a day of training with a 12-minute run in the heat of Miami.
1979
George Gojkovich/Getty Images
Steelers wide receivers John Stallworth (82) and Lynn Swann pose during training camp at St. Vincent College in Latrobe, Penn.
1981
Paul Vathis/AP
The Redskins' new head coach Joe Gibbs leads the rookies in exercise drills during the first day of training camp in Carlisle, Penn.
1982
Tony Tomsic/Getty Images
Vikings head coach Bud Grant reviews a play with his offense during training camp in Mankato, Minn.
1982
John Iacono for Sports Illustrated
The Bears' new head coach Mike Ditka smiles during training camp at Lake Forest College in Lake Forest, Ill.
1983
Bruce Bennett Studios/Getty Images
The Giants' new head coach Bill Parcells shouts instructions to his players at training camp in Pleasantville, N.Y.
1983
Andy Hayt for Sports Illustrated
Broncos rookie quarterback John Elway does pull-ups during training camp at University of Northern Colorado.
1985
AP
Miami quarterback Dan Marino and teammates struggle through a 12-minute run at Dolphins' training camp in Miami.
1985
Jonathan Daniel/Getty Images
Mike Singletary helps teammate Wilber Marshall stretch during Bears training camp at the University of Wisconsin-Platteville.
1986
Jonathan Daniel/Getty Images
Jim McMahon and Walter Payton sign autographs for fans during training camp at the University of Wisconsin-Platteville.
1986
Chuck Solomon/WireImage
Steelers defensive coordinator Tony Dungy instructs his players during a training camp session.
1987
Jonathan Daniel/Getty Images
The popular Walter Payton signs autographs during training camp.
1990
Al Golub/AP
Future Hall of Famers Joe Montana and Steve Young loosen up during 49ers training camp at Sierra College in Rocklin, Calif.
1993
John Iacono for Sports Illustrated
Patriots quarterback Drew Bledsoe stretches during training camp at Bryant College in Smithfield, R.I.
1993
Tracy Frankel/Getty Images
Running backs Jerome Bettis (36) and Tim Lester work on their form at Rams' camp. Bettis was the first round selection, 10th overall, of the Rams from the University of Notre Dame.
1993
John Biever for Sports Illustrated
Legendary Packers defensive end Reggie White takes a bike ride as two fans try and chase him down.
1994
Simon Bruty/Getty Images
Placekicker Tony Meola (1), who served as goalkeeper during the U.S. soccer team's 1994 World Cup run, stretches with Nick Lowery during Jets training camp at Hofstra University in Hempstead, N.Y.
1995
Brian Bahr/AFP/Getty Images
Former Heisman Trophy winner Desmond Howard (left) and teammate Willie Jackson sign autographs while standing in trash cans filled with ice water during training camp for the expansion Jaguars at the University of Wisconsin-Stevens Point campus.
1995
Al Tielemans for Sports Illustrated
Dallas offensive lineman Nate Newton attempts to run sprints.
1996
Rhona Wise/AFP/Getty Images
Miami new head coach Jimmy Johnson drills rookie linebacker Zach Thomas during opening day of Dolphins' training camp in Davie, Fla.
1997
Stephen Dunn/Getty Images
Emmitt Smith and Michael Irvin ride in a golf cart during the Cowboys training camp at St. Edwards University in Austin, Texas.
1999
Heinz Kluetmeier for Sports Illustrated
Bryant Young (97) greets teammate Ken Norton Jr. during 49ers training camp.
1999
Mark Duncan/AP
Quarterbacks Ty Detmer, Thad Busby, Mike Cook and Tim Couch practice taking snaps from the shotgun formation at the Browns training camp. This was Cleveland's first season of football since Art Modell moved the original franchise to Baltimore following the 1995 season.
2000
AP
St. Louis quarterback Kurt Warner signs autographs following the Rams' practice during training camp at Western Illinois University in Macomb, Ill.
2000
AP
Colts quarterback Peyton Manning drops back with backup quarterbacks Pete Gonzalez (left) and Kelly Holcomb (right) during a drill at the teams' training camp in Terre Haute, Ind.
2000
AP
New England wide receiver Terry Glenn loses possession of the ball to a dog during Patriots training camp in Foxboro, Mass.
2001
AP
Eddie George gives Bruce Matthews a towel after he was doused with a bucket for his 40th birthday after practice at the Titans' training camp in Nashville, Tenn.
2004
Tom Dahlin/NFL/Getty Images
Pro wrestler Brock Lesnar fights through the offensive line in a morning drill during Vikings training camp in Mankato, Minn. Lesnar played during the preseason for Minnesota, but ended up being a late cut.
2004
Peter Read Miller for Sports Illustrated
Bengals quarterback Carson Palmer looks to throw during training camp at Aliso Viejo, Calif.
2007
Jim Rogash/Getty Images
Patriots quarterback Tom Brady and wide receiver Randy Moss get in sync during a training camp practice in Foxboro, Mass.
2009
Al Tielemans for Sports Illustrated
Newly acquired quarterback Michael Vick (7) speaks with veteran Donovan McNabb during Eagles training camp in Philadelphia.
2010
David Bergman for Sports Illustrated
Jets quarterback Mark Sanchez shows off his receiving skills at training camp in Cortland, N.Y.
2010
Doug Pensinger/Getty Images
Broncos guard Zane Beadles dives into the mud as rookies partake in the slip and slide fumble drill during training camp at Dove Valley in Englewood, Colo.
2011
John W. McDonough for Sports Illustrated
Chargers defensive end Antonio Garay, a man of many hairstyles, signs autographs for fans.
2013
Scott Strazzante/Chicago Tribune/MCT via Getty Images
Bears wide receiver Alshon Jeffery stretches prior to practice during training camp at Olivet Nazarene University in Bourbonnais, Ill.
2014
David J. Phillip/AP
Texans defensive end J.J. Watt takes a selfie with a fan after training camp practice in Houston.
2014
Alex Brandon/AP
Redskins quarterback Robert Griffin III takes a selfie with a group of fans after training camp practice in Richmond, Va.