Masa Katsu Dojo is a martial arts school in Ames, Iowa, practicing Nami Ryu Aiki Heiho under the guidance of Mr. James Williams of The Dojo of The Four Winds, who conducts annual intensive seminars in Ames. Training centers on aiki-jujutsu and kenjutsu, with additional study of related combat techniques and Japanese weapons, particularly jo jutsu. Instruction includes ukemi waza, nage waza, joint locking, ground grappling, striking, and tameshigiri as part of the kenjutsu curriculum. Classes are held on Thursdays from 7:00 to 9:00 p.m. and Sundays from 6:00 to 8:00 p.m.