Systema (, literally meaning The System) is a Russian martial art. Training includes, but is not limited to: hand-to-hand combat, grappling, knife fighting, and firearms training. Training involves drills and sparring without set kata. In Systema, the body has to be free of tensions, filled with endurance, flexibility, effortless movement, and explosive potential; the "spirit" or psychological state has to be calm, free of anger, irritation, fear, self-pity, delusion, and pride.