But for Mariota, who is expected to be an early first-round pick and eventually a brand-name player for an NFL franchise, what he does with a football won't be as important as what he shows in his post-workout interviews.
Throwing passes to uncovered wide receivers in a scripted session, Mariota should show scouts everything they already know he has: accuracy, arm strength, athleticism and a quick release. The questions NFL scouts have about Mariota -- namely, his ability to operate from a huddle, from under center, and within pro-style offensive concepts -- can't be answered in a pro-day workout.
It's in the interview process, which began last month at the NFL Scouting Combine -- and will continue through pro day and leading up to the draft -- where NFL clubs will see how much of a learning curve Mariota will face in his first year as a pro. Mariota is expected to get some extra attention from the Tennessee Titans on Thursday, who hold the No. 2 overall pick, following his workout. More so than the Titans' impression of Mariota on the field, their interaction with him after his workout could play a role in whether they make him the second pick of the draft.
Fortunately for Mariota, he got a crash course in interviewing with NFL clubs at the combine.
Handling any subsequent questions clubs might have at his pro day should be easy by comparison.