The Vikings have just started training camp, and besides sharpening physical skills, coach Brad Childress said there are other personal factors that might decide how a player might perform.
In fact, if you are a psychologist, it helps in coaching a football team.
"You know, it's not as much question marks as it is always the neat thing for me is to watch everybody come back and to kind of form this group together," Childress said. "There's always different dynamics, whether a guy has gotten married in the offseason, or had children, or had family issues, or got divorced or separated, or had something happen.
"Everybody comes in at a different station in life and so that's always the interesting part to me, to blend that whole thing together. Hopefully they've got a chance to relax [in the offseason] and they're still in great shape.
"Every year is so different, whether you're starting or whether you're going on your fifth year. I'm just as excited. This will have a little different dynamic to it this year, but last year will have nothing to do with this year. You've got to kind of eke it out all the way along."
Training camp always yields something unexpected, he said.
"Always the fun part is taking these guys to camp and there's always surprises," he said. "There's always guys that show up, they've gotten better through the offseason program or whether they're showing up as first-time guys on our football team, that they've got a little extra heartbeat and find a way to make the football team.
"I think as we started last year, we had seen flashes of Sidney [Rice], but he was finally completely healthy last year. I thought Darius Reynaud had a good year last year during training camp. He kind of showed up and made everybody pay attention."