The Minnesota Vikings' star, who won the MVP last season when he rushed for 2,097 yards -- 9 shy of breaking Eric Dickerson's single-season record -- after he underwent reconstructive knee surgery, offered a reminder that he wasn't himself at the start of the season, either.
"I got stronger," Peterson said. "With (Griffin), it's going to be week by week. The quarterback position is different. He's not just running the ball -- he's back there going through progressions and trying to find guys and really being on alert. He'll be OK."
Peterson tore his ACL and MCL in the 2011 regular-season finale. Like Griffin this year, he sat out the preseason, then started slowly before embarking on a magical season.
"I definitely set the bar high," Peterson said. "I think all things are possible when everything meshed together as far as workouts, the healing process, not really encountering any type of setbacks."
Griffin has thrown for 649 yards and five touchdowns in two games, but the Redskins have fallen into huge holes in both losses. After running nine times in the first two games, none on designed runs or off the zone read-option, Griffin is ready for more.
"I'll do whatever we have to do to win the game," Griffin said ahead of this week's game against the Detroit Lions. "That's always been my mindset. I'm the quarterback. If I have to create that energy, if I have to spit a rap line in the huddle, I'll do it. Whatever it takes to get that energy."
Peterson again offered his advice to anyone coming back from a torn ACL.
"Mentally, just have that confidence that the ligament is strong and trust your body," Peterson said. "Just life in general, you can kind of mess yourself up in the head thinking too much. You just tag on an injury and coming back, it can really make it hard on yourself. Mentally, just have faith in the work you put in and just (go) out there and play."
Information from ESPN.com Vikings reporter Ben Goessling and ESPN.com Redskins reporter John Keim was used in this report.