The workouts start Thursday with the defensive linemen and the linebackers, where a 40-yard dash could mean the difference in earning millions of dollars on a first contract. One prospect who won't be participating is Penn State edge rusher Abdul Carter,

The NFL Scouting Combine is underway from Lucas Oil Stadium in Indianapolis. While prospects have descended onto Indianapolis over the last few days, the action ramps up Thursday as the players begin to hit the field.

The NFL Combine continues on Friday, with the spotlight shifting to defensive backs and tight ends as they take the field for workouts.