A user propelled water board apparatus (2) is described and comprises a hull, porti.oxi (4) defining a longitudinal axis x-x. The hull portion (4) is buoyant, to enable a user (6) to rest on hull portion (4) and be supported on the surface of a body of water (8). First and second lateral fin members (10) and (12) are pivotably mountable to the hull portion (4) in a position to project into the body of water in use. The first and second lateral fin members (10) and (12) are mounted in use on opposite sides of the hull portion 4 and are pivotable towards and away from the hull portion in the direction of arrow A. A user (6) rocking the hull portion in water about the longitudinal axis x-x causes the first and second lateral fin members (10) and (12) to pivot outwardly from the hull portion and drive the hull portion through the body of water in use
