15. Amare Barno – 4.36
Barno can run very fast in a straight line. He achieved the fastest 40-yard dash time for a defensive linesman since 2003. That’s not bad for a six-foot-six behemoth with a weight of 245 pounds. Of course, this isn’t a guarantee that he’ll be a success in the NFL but is a great asset.

The Virginia Tech star has a gigantic wingspan. However, despite his size, he lacks bulk. This is a concern for NFL scouts ahead of the draft and it will affect his prospects. If he fills out, he will become a force to reckon with. But he needs another 10 pounds at least (via NBC Sports).