EDEN PRAIRIE, Minn. -- Adrian Peterson said his first two days on the practice field went pretty smoothly, after the Minnesota Vikings decision to designate him for return from injured reserve. But coach Mike Zimmer cautioned the Vikings still have plenty to determine before deciding when Peterson would play and how he would be used.Well have to see where hes at in conditioning. Theres so many things to figure out, Zimmer said. I think hes in pretty good shape, but he hasnt sat in meetings for three months. Theres a lot of things to consider.Peterson, who tore the meniscus in his right knee against the Green Bay Packers on Sept. 18, practiced for the second time on Thursday. The running back has said hes shooting to return for the Vikings game against the Packers on Dec. 24, but he has also cautioned he wouldnt play if the Vikings arent in the playoff race, adding it would be pointless to return for games that didnt have postseason implications.Asked on Thursday about the running back saying it will be his decision when he returns, Zimmer said, I wouldnt say it was his decision. I would say its a combination. Well sit down and talk, and the medical people [will weigh in]. Its a lot to do with the medical.Said Peterson on Thursday about the Packers game: That was the goal I had set for [myself], but Im going to continue to take it one day at a time. When that time comes, as a group, well sit down and talk.The 31-year-old running back will have to weigh his future in deciding whether playing this season is worth it. The Vikings hold a team option on Peterson for 2017, with a $6 million roster bonus due in March and $18 million cap hit, but if Peterson were to return to Minnesota next season, it would seem likely to be on a restructured contract.Id be lying to you to say that [the future] is not factoring in [to the decision], he said. In my mind, Im telling myself that its 100 percent healed, but I really wont know until I look and see it from images. So with that, youve got to be smart about how you approach everything.Its not really [about proving myself to the Vikings]. A little bit, but I feel like thus far, Ive proven myself. Ive been doing this for 10 years. Its not the first injury Ive overcame, came back and was still able to be successful. Proving anything to the organization, I dont think I have to do that. I think it speaks for itself.Peterson has been wearing a knee brace in practice the last two days, and though he has typically shied away from using one in games, he said hed likely wear one the rest of this year, as he tries to come back from an operation that can keep players out between four and six months.Its like, Why not? The new titanium braces are superlight, he said. Its a little uncomfortable, because I really dont like anything on my knees. But taking in the situation, Ill wear it.The Vikings tumultuous season means Peterson would be returning to a team that looks noticeably different than the one he played for on Sept. 18. Since Pat Shurmur replaced Norv Turner as the offensive coordinator on Nov. 2, the Vikings have been in shotgun sets two-thirds of the time, with their 247 shotgun snaps ranking seventh in the league in that time, according to ESPN Stats & Information.Peterson said Thursday that some of the Vikings offensive terminology has changed in the switch from Turner to Shurmur, though the core of the offense remains the same. There are a couple wrinkles in there that are a little different, he said. The meeting room is different as well. We have the same offense we had previously, but just with some new twists.Zimmer added he has not yet talked with Peterson about how the Vikings plan to structure his workload. Thats completely up to the medical people what he does, he said.A Peterson return should provide a boost to a Vikings rushing attack thats on pace for the worst rushing average since the New England Patriots in 1994. 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Tim Robin Johnsgard had the lone goal for Norway (0-2).NEW YORK -- Serena Williams turned heads when she made a cameo in Beyonces Sorry music video -- where she twerked heavily -- and now the tennis star is releasing her own dancing video.Williams, who released a new video Thursday on YouTube that features the 34-year-old dancing in a variety of styles, says dance is one of her favorite hobbies.This video really kind of taps into a lot of emotions that I have and a lot of emotions that I feel. And one of the things that I say is that ...I always keep climbing, and thats something that really resonates with me, Williams said in an interview on the set of the video last week.Everyones like, `Why are you still playing? Why are you doing this? `Cause Im always challenging myself, Im always keeping myself climbing.Williams is currently battling a shoulder injury, but said the dancing she filmed did not involve her shoulder. The top-ranked athlete began her bid for a record-breaking 23rd major title in the U.S. open this week.On the video set last week in Brooklyn, New York, she said she was just moving more or lesss my legs.dddddddddddd. Right now (my shoulder is) doing OK. Im taking it day-by-day.I work really hard at what I do. Ive had some ups and downs this year but you know ...I always just try to come back and do the best that I can, she added.Williams worked with choreographers Will Willdabeast Adams and Janelle Ginestra for the video along with Delta Air Lines. She said she remembers learning a great deal about dance from Beyonces team of choreographers when she filmed Sorry, which appears on the pop stars visual album, Lemonade.Dancing in the Beyonce video was obviously a lot of fun. I remember being super sore after because I was down the whole time, you know, kind of twerking a lot, she said. I was able to work a lot with her choreographers ...and I really learned so much just about my body movement and also different styles of movement to do.-----Online:Serena Williams dance video: https://www.youtube.com/watch?v=ctsHgAsLn5M ' ' '