Quarterbacks Matthew Stafford, Daunte Culpepper, and Drew Stanton participate in team exercises. (Gregory Shamus/Getty)
Calvin Johnson runs past Ramzee Robinson during Lions camp. (Greg Shamus/getty)
Lions receiver Calvin Johnson runs full tilt during training camp. (Greg Shamus/getty)
Lions receiver Calvin Johnson stretches as he jokes with teammates during Detroit's training camp. (Greg Shamus/getty)
Lions receiver Calvin Johnson takes a break during the team's training camp in Allen Park, MI. (Greg Shamus/getty)
Daunte Culpepper kneels during the team's training camp in Allen Park, MI (Greg Shamus/getty)
Lions head coach Jim Schwartz looks on during his team's training camp session on August 4. (Greg Shamus/getty0
Matthew Stafford during the team's August 4 training camp session. (Greg Shamus/getty)
Matthew Stafford during the team's August 4 training camp session. (Greg Shamus/getty)
Matthew Stafford during the team's August 4 training camp session. (Greg Shamus/getty)