Focus: honing their games.(NFL)

Jets CB Justin Miller has the speed and athletic ability to handle man-to-man coverage. But like many young corners, he needs work in zones. He still is learning where his help is supposed to come from.... CB Aaron Glenn played well in his first season with the Cowboys, but he struggled in jump ball situations and gave up four touchdowns. Glenn usually tried to intercept the pass when the higher-percentage play was simply to knock the ball down. He is working on being more technically sound so his movements become instinctive when the ball is in the air.... Bills RT Jason Peters is a natural run blocker and an improving pass protector, but he must work on his mechanics. He's a former tight end, so mobility is not a problem. He has to maintain his balance and footwork, use his hands to redirect defenders and avoid getting beaten on countermoves. ... Eagles RG Shawn Andrews' weight-training program is designed to help him get down to 340 pounds. When Andrews is in that neighborhood, he has the quickness to pull, slide out and lock on to a linebacker. When his weight balloons to 370, he loses that edge and is reduced to grabbing and holding, which result in too many penalties.... The Texans' Antwan Peek is adding bulk as he tries to make the transition from outside linebacker to pass-rushing defensive end. Peek was a natural at end in college, and he will be an integral part of Houston's focus on getting to the quarterback.... Vikings WR Troy Williamson has all the speed he will ever need, but he must stop dancing at the line. Coaches want Williamson to move directly into his route and fight past defenders at the line. If he does that successfully, no defensive back will have the speed to catch him. ... If QB Marc Bulger doesn't understand the Rams' ...