MANKATO, Minn. — A day after releasing grossly out of shape Bryant McKinnie, the Minnesota Vikings displayed an impressive overall conditioning level during their first practice with shoulder pads. The defense looked quick, fast and in good shape, particularly OLB Chad Greenway, CB Antoine Winfield and DT Kevin Williams. Vikings defensive tackle Kevin Williams runs through drills at training camp in Mankato, Minn. (AP Photo)Offensively, Adrian Peterson missed his second day of practice because his fiancé is due to give birth. QB Christian Ponder had the best practice. He’s still working behind Joe Webb, but that won’t last if Ponder keeps throwing the ball the way he did Wednesday. Ponder showed good arm strength on deep balls, accuracy on passes between defenders over the middle and a soft touch on shorter throws. All of his passes were smooth and crisp. Don’t be surprised if he moves up to No. 2 behind Donovan McNabb as early as Thursday. Notes: CB Cedric Griffin took part in team drills for the first time in camp. He ran well, turned his hips quickly and made all the cuts without any signs of having torn both ACLs over the past two seasons. He wore only a sleeve over his right knee. Griffin tore an ACL in the NFC Championship Game two seasons ago and then the other one in Week 2 last year.