Taijutsu is a term from Japanese martial arts. Commonly interpreted nowadays as unarmed combat, it is actually quite different. This fallacy is shared by even many of the top Japanese martial artists of today, and one which is not easily shed. The actual meaning is "art of body movement", or quite simply just "body movement". Even armed combat requires good taijutsu in that it requires good body movement.
One of the primary aspects of taijutsu is footwork. Without proper footwork, someone's taijutsu literally falls apart at the seams. It is for this reason that most classes teach unarmed combat before going onto weaponwork - to setup a solid foundation in footwork and body dynamics before going onto more difficult areas.