Day two of the 2013 NFL Scouting Combine is underway in Indianapolis, though the cameras don't go full live until Saturday when the on-field workouts begin.

Today, Group 1 (a mix of special teams specialists and some o-linemen), Group 2 (the rest of the offensive linemen) and Group 3 (all tight ends) go through the backroom stuff -- official measurements, medical testing, interviews and media opportunities.

The o-lineman measurements are already filtering out, largely thanks to NFL.com's Daniel Jeremiah, a former scout who you may remember from his last mock draft where he pegged the Rams to take UNC guard Jonathan Cooper and Florida St. OT Menelik Watson with their two first round selections.

Already, his Twitter timeline, @MoveTheSticks, is blowing up with some of the measurements of the major prospects:

I'm told Alabama OT DJ Fluker checked in at 339 lbs today. He was 355 at the Sr Bowl. #NFLCombine

— Daniel Jeremiah (@MoveTheSticks) February 21, 2013

Chance Warmack checked in at 6'2 317 lbs. Smaller than expected but he did have 34 6/8 inch arms

— Daniel Jeremiah (@MoveTheSticks) February 21, 2013

Menelik Watson checked in at 6'5 1/8 310 lbs. His arms were 34 inches. #NFLCombine

— Daniel Jeremiah (@MoveTheSticks) February 21, 2013

Jonathan Cooper 6'2 1/8 311 lbs. Lane Johnson 6'6 303. #NFLCombine

— Daniel Jeremiah (@MoveTheSticks) February 21, 2013

Should be an interesting day as more prospects go through the meat market. For those of you looking for a little more flash, Group 4 (a mix of quarterbacks and wide receivers), Group 5 (remaining QBs and WRs) and Group 6 (all running backs) arrive today. They'll hit the field on Sunday, but until then, we'll have plenty of Combine coverage both on the ground in Indy and across the intertubes.