Adrian Peterson welcomed back to Vikings with 'open arms'

Adrian Peterson returned to the Minnesota Vikings on Tuesday, participating in organized team activities with 88 teammates. Head coach Mike Zimmer kicked off a Tuesday afternoon press conference by saying "we welcome him back with open arms, unequivocally."

"Feels good to be back," Peterson said. "This past year has been emotional for both parties involved. I've learned a lot from my mistakes."

Peterson returns to football after sitting out all but one game of the 2014 season on the commissioner's exempt list – discipline that stemmed from a felony child abuse charge he faced in Texas for whipping his then 4-year-old son with a switch. Peterson eventually pleaded no contest to a lesser misdemeanor charge.

VIDEO - No. 28 returns to practice field

The Vikings official Twitter account posted video of Peterson walking out onto the practice field Tuesday morning.

Learning from mistakes

"I've moved forward," Peterson said. "I'll focus on what's in front of me and better myself as a person and professionally as a player."

Peterson said he went through therapy in the offseason, including group sessions with his son.

"The first person I apologized to was my son," he said. "I realized what had happened. I apologized for the mistake I had made."

Relationship with son

"It's good. It's love. I've made a mistake," Peterson said. "The first time I saw him he came up with a plan to escape and come back to Texas."

Performance at age 30

Peterson: "Age is just a number. It's all about how you view it mentally."

Zimmer: "I saw a report on 30-year-old running backs and many of them had great, great years…This is a Hall of Fame player, not just some guy off the street."

Trade conversations involving Adrian Peterson

"None," according to Zimmer.