Adrian Peterson tore his ACL in the Vikings' final game of the year, not too big a loss for a team that was eliminated from the playoffs long before that. The goal during the off season was to hopefully get Peterson back in time to play the 2012 season, and it looks like even if he's not ready at the start he should be good to play very early into the year.
Hard work, determination, desire: goal: September 9. Thanks to my fans, friends and family for your continued support
Getting back to playing form by the time the first game of the season rolls around would be a heck of a feat, but his recovery has been going well enough so far that it's not out of the question at all to think that even if he misses all the training camp and preseason games, Peterson will be ready to play for the season.