Three models are produced by Theraquatics Australia: The Theraquatics Balance Board is a V-shaped rocker board that a user stands, kneels or sits on. The Wonder Board is a V-shaped rocker board that a user kneels or sits on. The Aquatic Balance Board (a.k.a. the Aquafit Balance Board) is a wobble board. The holes in it allow water to fill it, making it neutrally buoyant (i.e., neither sinking on its own nor floating up to the water's surface) so that it is easier to control and safer than it would be if this wobble board were more buoyant.