The 2013 NFL Scouting Combine gets underway today. The drills do not begin yet, but there are other important activities taking place per SBNation.com.

Group 1 (PK, ST, OL) Group 2 (OL) Group 3 (TE)

Measurements - Medical Examinations - Media - Interviews

Group 4 (QB, WO) Group 5 (QB, WO) Group 6 (RB)

Travel to Indianapolis - Registration - Hospital Pre-Exam & X-Rays - Orientation - Interviews

Groups 7-11, which cover the rest of the position groups, do not report until Friday.

Thursday and Friday's events will mostly be behind the scenes activity. The real action does not begin until Saturday, when each position group will be participating in NFLPA meetings, psychological testing, bench press, interviews and an array of skill drills.

The medical exams are going to be important for players with a serious injury history, and the same is true of interviews with players who have character concerns. If you notice a player mysteriously falling in April, odds are it is because of either a bad medical report or a bad job interviewing today.