Big money is on the line and careers are at stake in the workouts leading up to the 2009 NFL Draft. Some players are able to get faster and stronger with additional training and others appear to only be treading water.

Penn State Outside Linebacker Aaron Maybin is in the category of the faster and stronger as he greatly improved his times at Penn State's Pro Day. At the NFL Scouting combine he ran a mediocre 4.88 forty and at his Pro Day he ran a couple 4.64 and 4.71 second forty yard dashes. He also measured in at 6' 4" 250 pounds and executed a nice 40 inch vertical jump (VJ). He (Maybin) is only a sophomore and he will have to learn a new position converting from defensive end in college to an outside linebacker in the NFL, but Maybin is as explosive as they come and could give an NFL team a DeMarcus Ware type pass rush.
Penn State's WR Derrick Williams has seen his draft stock plummet from an early second rounder to a 4th or 5th rounder after a horrible 4.62 forty at the combine. However he might have jumped a round after a very good workout at his Pro Day. Williams ran two forties at 4.47 and 4.50 and had a very nice 6.96 second 3-cone time. On film he looks fast though and he has been a playmaker for Penn State for three years.
Virginia Tech's CB Victor (Macho) Harris (5' 11" 197 lbs) has also seen his draft stock plummet. Remember entering the 2008 college football season many had Macho as a possible first round selection in the 2009 NFL Draft. During the season he struggled covering speedy receivers and at the NFL Scouting Combine he ran a pathetic 4.63 second forty. Even though he has great instincts and is a solid tackler, I doubt many NFL teams would call his number before the 6th round with that questionable speed. Will the real Macho Harris please stand up? At his Pro Day the quick corner of yesteryear emerged, Harris ran a very nice 4.46/4.50 forty and had a lightening quick 4 second short-shuttle time. Is it home field advantage or did he just have a bad combine?
Georgia RB Knowshon Moreno wasn't able to improve his 40 time from the combine. He ran a 4.60 forty and confirmed the fact that he isn't a home run hitter. That's fine though, Moreno runs hard and strong, can break tackles and cut on a dime, he reminds me of former Cowboy Emmit Smith. Reportedly the Chargers are going to bring hm in for a private workout.
Vanderbilt's DJ Moore (5' 9" 184 lbs) is another enigma. On film he looks very fast, but under the stop watch he isn't impressive. Due to average foot speed he has probably slipped from a late first rounder to a late second rounder. He ran a 4.53 at the combine and a 4.57 during his Pro Day workout. Also, his 7.00 second time in the 3-cone drill wasn't overly quick or explosive.