Calvin Johnson, WR DETNews: Lions offensive coordinator Mike Martz said Thursday that rookie WR Calvin Johnson has hit the proverbial "wall," meaning that his body is tired from all the work it's been taking on. "He hit the wall physically pretty good here last week," Martz said. "He's just really leg weary. He's starting to recover now pretty good. The information, I think, was starting to sound like Chinese to him for a while. But he'll sort through this. He's still got a ways to go now. When he doesn't have to think about things and when his legs are in shape, then he'll really progress quickly. I think that's what we're looking for at the end of the year."Analysis: Martz added that this is typical and that the Lions were expecting this. Figure that in between the end of the preseason and the early part of the regular season, Johnson will be strong. Remember, he's just a rookie, but he has a ton of potential. He should be a top pick in rookie drafts and a middle-round selection in all seasonal leagues. Consider him a No. 3 Fantasy WR to start the year with the chance to see his value rise.