The first week after Adrian Peterson's reconstructive knee surgery was a grueling one. The pain from the surgery was agonizing, and it prevented him from sleeping much most nights. That means there was plenty of time for the mental torture to take its toll as well, as the Minnesota Vikings star running back wondered what he could have done differently in that game against the Redskins to prevent such a devastating injury. Now that Peterson is up walking around and has started the rehabilitation process, he is determined to return to his All-Pro form. 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.