Vikings' running back Adrian Peterson has 684 rushing yards, good enough for second in the NFL but vows to have a better second half. "To be honest, and it's not about individual stats or anything like that with me, but I really don't feel like I have performed well in the first half, especially watching the film," Peterson said in a teleconference. "I really haven't played my best ball this year at all." Peterson rushed for 121 yards, including a 54-yard touchdown, against the Bears two weeks ago in what he considers his best game of the season. "I really see a lot of things I was doing differently in that game that I'm going to take on to the second half," Peterson said. "I just look forward to doing better the second half, which I am going to do. I'm just going to help my team any way I can."