Abstract: A balance trainer on which a user can perform various modes of movement that make it possible for the actual environment to simulate an imagined environment, providing an enhanced training effect. The balance trainer comprises a trainer board that has a top surface on which the user stands, and a bottom surface facing the floor, and rollbar that supports the trainer board while allowing the trainer board to yaw, pitch and roll with respect to the floor surface. By changing the position of his center of gravity, the user can perform many types of movement with the balance trainer.