Throwback Thursday: Rob Gronkowski's Pro Day at Arizona

Video from agent Drew Rosenhaus after the 3-hour workout in 2010

Rob Gronkowski had just finished the three-cone drill, headed for a break on the sideline, when he uttered, confidently, "The beast is back, baby."

It was Saturday, March 27, 2010.

The former Arizona tight end worked out that day at Arizona Stadium in front of scouts representing 22 teams (hard to believe now that 10 teams weren't all that interested).

Gronkowski, who missed his junior season at Arizona because of back surgery, skipped the combine and UA's Pro Day because he wasn't fully recovered.

On this day, he worked out for three hours, after which his agent, Drew Rosenhaus, was ecstatic.

"Without exaggeration, Rob put on a show," Rosenhaus said.

"He was spectacular in his times. He was brilliant in his routes. He demonstrated his is healthy. He is clearly the No. 1 tight end in the draft."

Well, Oklahoma's Jermaine Gresham, a first-rounder was, but you know the rest. Gronk has put on a show in the NFL.

In the above video, take a trip down memory lane to the day he really began to show scouts his stuff.