According to this GopherHole interview, his HS coach (Arnel Monroe) describes a very athletic young man.
http://www.forums.gopherhole.com/modules.php?name=News&file=article&sid=1586
"He was a good football player last year on a team that came close, but he was 210 pounds...Alex puts on 30 pounds in four months under our new weight program and we are in no means as specialized as a BCS school will be in far as his athletic training, so the sky is the limit for what that kid can do. He could be 260, 265 easy and I mean a swell 260, 265 by December of next year if he gets after it. He has the bone structure. He’ll still be explosive. He picked up 30 pounds and he still runs a 4.57, 4.6 flat (40-yard dash)."
Looks like a nice find by Kill and his staff. Seems like they worked to build relationships early (with Keith and his coaches) and kept kept after the sales process. These guys know what they're doing.