Abstract: Apparatus for learning to ski, comprising a harness (2) which sustains the skier (1) who is unbalanced just prior to a fall, the harness being connected to a movable carriage (6) by retention straps (13a). The carriage (6) moves on a roller track which serves as a rail (8). The carriage (6) is mounted on rollers and comprises brakes (10a). The brakes (10a) may be automatically actuated by the beginning of a fall of the skier (1), the retention straps (13a) being connected to the brakes (10a).

Abstract: Swim flippers having a shoe portion and a fin portion. The fin portion is formed with a continuous through channel for the flow of water, an exit at its forward end, an inlet opening at the trailing end in each of the upper and lower surfaces. A flap, responsive to the movement of the flipper in water is provided between the inlets for directing the flow of water into one of the inlets while simultaneously closing the other of the inlets.