Adrian Peterson believes he can still get better

Minnesota Vikings linebacker Adrian Peterson had his best game since returning from a torn ACL on Sunday versus the Detroit Lions, running for 102 yards on 21 carries, which was good for 4.9 yards per rush. Peterson, though, told reporters after the game that he doesn't feel all the way back and thinks he can "get better."

If so, that's a scary thought for the rest of the NFL. Peterson is already on pace for a 1,300 yard season, a barrier that he has broken three times in his career, but not since 2009. Through four games, Peterson has rushed for 332 yards and two touchdowns, but his carries have begun to tick up in the last two weeks.

Peterson's teammates also feel good about the running back's progression. According to Percy Harvin, Peterson told him before Sunday's game that he was feeling "icy" – which in the two's parlance is a synonym for "good." Quarterback Christian Ponder told reporters after the game that Peterson is running like he's at 100 percent, even if he isn't quite there yet.