Constantine Leibman

Constantine Leibman was a martial arts instructor and Russian immigrant from Columbus, OH, who competed on American Ninja Warrior 2. He is known for his "fireman" costume while running, as well as training with David Campbell.

In qualifying, despite struggling on the Quad Steps, he managed to get through the first half of the course with relative ease. However, on the Spider Jump, he got too high on the walls and began to look down instead of straight ahead, which caused him to strike his head on one of the support beams. Due to the impact, he slipped and grabbed the top of the walls, disqualifying him.