MINNEAPOLIS (AP) - A person with knowledge of Adrian Peterson's offseason workouts tells The Associated Press that  star running back has decided not to attend Minnesota's spring strength and conditioning program.

The person spoke to the AP on condition of anonymity because of the sensitivity of the situation on Monday, the first day Vikings players gathered at team headquarters for supervised workouts.

Peterson's absence was expected, of course, given his expressed disinterest in returning to the organization. Even in a normal year, Peterson's presence during the offseason has been rare. He spent some time in Minnesota last year to get acclimated to coach Mike Zimmer's staff, but Peterson's preference has been to prepare with his personal trainer at home in the Houston area.