Following major knee surgery, Vikings running back Adrian Peterson is up walking around and has started the rehabilitation process. Peterson and Vikings head athletic trainer Eric Sugarman met with reporters on Friday to give an update on his recovery, two weeks after Peterson had surgery to reconstruct the ACL and repair the MCL in his left knee. "I feel like the first week was the toughest part for me, not being able to sleep, waking up every two hours, just dealing with the pain and the frustration, looking ahead like, 'Wow, I've got a long way before I'm able just to move around and walk,'" Peterson said. "But after that first week, I feel like things really just started to calm down. The pain started to subside. I was able to just get more motivated about the process."