or the like a valve member 24 associated with each bladder may be used to inflate and deflate its associated bladder as desired preferably in the practice of the present invention each of the bladders contains the same amount of fluid so that they are substantially equal preferably the bladders are air bladders it is contemplated that the valves or valve members 24 will extend from their associated bladder through the platform 17 to facilitate accessibility thereto the compressible members are secured to the upper surface of the board by any suitable means such as through an anchor 30 alternatively the bladders may be secured to the upper surface 11 with a nylon hook and fastener velcro gluing or the like as noted the upper rocker assembly 31 is constructed similar to rocker member 19 and includes aperture flanges 31 u2032 and 31 u2033 the member 31 is secured to a platform 17 the platform 17 has an upper surface 17 u2032 and a lower surface 17 u2033 as shown the rocker 31 is integral with or otherwise affixed to the lower surface 17 u2033 as shown in fig5 the lower surface 17 u2033 of the platform 17 is substantially bisected by the transverse rocker or fulcrum member 31 into a pair of identical sections as shown in fig2 and 5 the bottom surface 17 u2033 of the platform 17 tapers from the member 31 to the outer perimetral edge of the board the taper permits the space 90 between the lower surface of the platform 17 and the upper surface 11 of the board 16 to reduce quickly when the platform and the board teeter into.