Abstract: Sporting device with an oblong, plate-like foundation (10), the underside of which is basically smooth in the front region (13) and in the rear region (14), and is provided with a runner system in the middle region (15), which includes two curved outside runners (16) with an inner side face which is convex, extending basically longitudinally on the foundation (10), which in each case project adjacent to the long edge of the underside of the foundation (10), two curved inside runners (17) with a convex inner side face and a concave outer side face, extending basically longitudinally along the foundation (10), which are arranged between the outside runners (16) and in each case project from the underside of the foundation (10) longitudinally at a distance to the corresponding outside runner (16), and a stabilizing runner (18), which extends along the middle longitudinal line of the foundation (10) between the inner runners (17), and projects from the underside of the foundation (10), whereby the outside runners