A gliding apparatus includes four gliding bodies that can be selectively separated or assembled together. In the assembled configuration, the first and second gliding bodies form opposite lateral portions of the gliding apparatus, and the third and fourth gliding bodies form a longitudinally extending intermediate gliding body defining a median portion of the gliding apparatus. A device to affix the four gliding bodies together includes first and second assembly elements that are affixed, respectively, to the third and fourth gliding bodies to form the intermediate gliding body. The first assembly element includes at least a first longitudinal projection, projecting from the fourth gliding body and designed to extend over an upper surface of the third gliding body. The first longitudinal projection of the first assembly element is designed to be engaged with the second assembly element to limit relative longitudinal spacing between the third and fourth gliding bodies.