MANKATO - Saturday morning, the veterans on the Vikings defense welcomed rookie running back Toby Gerhart to the NFL by treating him like a hacky sack at a beach party. They smacked him to the ground, then taunted him, offering an early reminder that violence is a defensive player's milieu, his currency.
Even these hardened men turned away on the night of Dec. 6, 2009, when E.J. Henderson, their star middle linebacker, sprawled on the field in Glendale, Ariz. As Henderson chased a Cardinals running back, Vikings safety Jamarca Sanford submarined Henderson's left leg, breaking his femur.
Most Vikings recoiled. Some cried. After the game, many were still oscillating like survivors of a car crash.
Less than nine months later, Henderson is on the Vikings' active roster and taking part in training camp, offering proof that NFL players are wired differently than most humans and insight into why the NFL has become the most popular game in America.
"I had never even heard of something like that happening, you know what I mean?" said former Vikings linebacker and assistant coach Pete Bercich, who coached Henderson and now is an analyst on Vikings broadcasts. "A guy breaks his femur like that, I don't know if coming back like this is crazy, or unique, because I had never heard of it or seen it.
"It is a remarkable thing, to snap the biggest bone in your body and just go back out there. I think it's amazing he'd even want to go back out there after something like that. In the NFL, you can truly say that these guys are putting their life and limb on the line. You can't say that about basketball, or baseball. But, unfortunately, we've had some people die on the field."
The NFL has eclipsed games of skill by becoming a game of remarkable speed and violence, by making football games into thrillers in which the actors do their own stunts. "I don't recommend this job," said defensive end Jared Allen. "I think someone once said it's the equivalent of getting into a 25-mile-an-hour car crash, and for linemen, it's every single day -- and especially on game day.
"We get maybe a day off, a day and a half, and we're back on the field working. Our bodies go through a lot. I think that's also why we can recover fast. Where most people might take years because they feel a little pain, we're used to a little pain.