OFFduty writer Jon Anderson caught up with Army Staff Sgt. Colton Smith, winner of season 16 of "The Ultimate Fighter," to talk about Smith's Filthy 50 workout.

Jon writes:

Ask Army Staff Sgt. Colton Smith if a single exercise or workout gave him the edge on the blood-and-guts reality show "The Ultimate Fighter," where he beat out 15 other top mixed martial artists and claimed the title in the latest season, and the answer comes quickly.

"The Filthy 50," he says. "It's terrible."

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Terrible — as in terribly demanding. CrossFit fans will recognize variations of the Filthy 50 from some of the more dreaded Workouts of the Day.

But Smith's version is on a level of filthiness only a fearless few will be fit to face.

(The above video is from Military Times photographer Mike Morones.)