I'm late to the game on this. Hopefully you've been watching this show for awhile.
US Special Forces soldier Terry Schappert hosts this History Channel show. He travels around the world and examines different warrior cultures from various points in history. They usually pick one significant battle to use as a focal point, and discuss the culture, training, weapons, technology, and other aspects of the warriors being featured. So far, I've seen Vikings, Samurai, English knights, Germanic Barbarians, Mayans, the Knights of Malta, and (of course) the Spartans.
The show is more than a little reminiscent of Human Weapon or Fight Quest. Mr. Schappert finds experts and re-enactors in the fighting techniques of the warrior culture, and spars or demos with them.
Schappert is one of the best things about this show. He's obviously passionate about this subject. He looks like he's having the time of his life trying out a different fighting culture every week. I always look forward to the climax of each episode. Schappert flails around with the weapons as he narrates and pantomimes the course of the battle. It would look silly, IF he wasn't having such a good time.