Action is underway in Indianapolis, where the offensive line prospects are in their drills, live on NFL Network and NFL.com.

The highlight so far is offensive lineman Terron Armstead of Arkansas-Pine Bluff running a 4.65 with a 1.64 10-yard split.

Clay Matthews had a 1.58 10-yard split at his Combine workout in 2009.

Interestingly, Armstead was a high-end track athlete as well in throws, and despite having several Division I offers, he chose Arkansas-Pine Bluff because former Redskins linebacker, Monte Coleman, the head coach there, was the only coach who would let him participate in track and football.

He had 30 reps of 225 on the bench press as well.

It's a fun day for these kinds of tidbits, so if you're watching, stick around Behind The Steel Curtain, we'll be here highlighting the cool things and making fun of the broadcasters.

SB Nation has multiple writers in attendance as well, and they're filing stories as the day progresses as well, so check it out.