"Being out there confirmed I'm ready to roll," Peterson said, via the Star Tribune. "I've had my head in the playbook."
All Day has been out since Sept. 18 with a torn meniscus. He returned to practice this week.
The Vikings could certainly use a boost on the ground. Behind a porous offensive line, Minnesota ranks last in the NFL with just 73.4 rushing yards per game. Prior to the injury in Week 2, Peterson was averaging just 1.6 yards per carry.
It's not the first time Peterson has returned earlier than expected. Clearly, the quick-healing colossus is from a different planet than the rest of us.