fig1 depicts one embodiment of the training board designed for aquatic use . it is contemplated that the materials used to construct this embodiment of the invention are sufficiently buoyant to support an adult human in the water . the rectangular platform 1 of this embodiment has a top edge 2 , a bottom edge 3 and side edges 4 and 5 . two or four apertures 6 are disposed in a centered fashion either along side edges 4 and 5 and / or top edge 2 and bottom edge 3 of rectangular platform 1 . these apertures 6 allow the user to grasp the training board on two opposing sides while doing exercises in a standing , or sitting position , as depicted in fig5 b , and 5c , respectively . the apertures 6 also allow the user to grasp the training board while in a supine or prone position . a further grouping of both round and rectangular apertures , 7 , allow the perpendicular guided flow of water through the training board 1 in a fashion to permit vertical water resistance to applied force of the training board 1 . fig2 is a hybrid embodiment designed either for terrestrial or aquatic use . this embodiment provides for the attachment of an elliptical modular ballast 8 to a rigid or semi - pliable , non - skid platform 1 having flow - through apertures 7 . the ballast 8 can have one or more male components 9 which insert into the flow - through apertures 7 . depending upon whether the use is terrestrial or aquatic , these male components 9 of the ballast 8 are held into place in the platform 1 by either gravity or buoyancy , respectively . one can insert , in a variety of fashions , straps 10 through the flow - through apertures 7 either to hold modular buoyant flotation cells 11 of varying sizes and / or so that an individual can insert his or her hands or feet through the straps 10 . the straps 10 may be of conventional construction or employ hook and eyelet closure . this will allow for more aggressive or faster movements of the training board 1 , as the training board will not &# 34 ; slip &# 34 ; away from the user . &# 34 ; squats &# 34 ; are an example of an exercise that may be performed when the feet are secured by the straps 10 , as shown in fig5 a . while partially submerged , the user first lifts the knees up , thereby drawing the board up ( at most two of feet of vertical displacement ), then the individual drives the legs down , thereby returning the platform 1 to its original position , whereupon the exercise may be repeated . one can elect to use a single strap 10 instead of two , thereby attaching only one foot to the platform 1 , if the individual wishes to perform one - legged exercises and / or balance training activities . if only one strap 10 is used , it must be centered on the training board 1 , to enable the board to stay level throughout the exercise movement . fig3 depicts a side view of one embodiment of the training board of the present invention . the board comprises a platform 12 having an upper surface 13 and a lower surface 31 . platform 12 may be of any shape / configuration ( e . g ., circle , rectangle , oval , square , octagonal ). the most practical shape for the platform 12 of this embodiment is circular , as a circle presents a constant circumferential distance between the edge of the platform 12 and the floor 14 , as shown in a top view in fig3 a . the user of such a board will have proprioceptive and visual feedback of the location of the floor 14 relative to the edge of platform 12 during balance exercise due to the circular configuration . with the acquisition of skill through practice by the user , safety is enhanced by the circular design . platform 12 has disposed at its center of gravity either a threaded screw 15 or male component 9 , which attaches to the platform 12 a solidly construction yet buoyant modular ballast 16 having either a centered and corresponding threaded female engagement site 17 or male component 9 . the ballast 16 can theoretically be any shape , but should be conducive for effective rehabilitation by being symmetrically elliptical and circular without abrupt edges ( e . g ., hemispherical ). such a configuration allows for safe and effective training or rehabilitation . the connection of the ballast 16 to the platform 12 is achieved either by rotating the centered , corresponding threaded female ballast engagement site 17 onto the threaded screw 15 until the ballast 16 is securely fastened , or fitting the male component 9 , onto the lower surface 31 of the platform 12 . this embodiment of the invention can be used both on land and in the water if the materials used to construct the board are buoyant enough to support an adult human in the water , yet strong enough to support the weight of an adult human on land . this embodiment can also be made solely for either land - based or aquatic training , exercise , and rehabilitation . fig4 and 4a depict a possible configuration for a functional , useful , and effective design of a second embodiment specifically designed for aquatic usage . the design , as shown in fig4 contemplates a rigid or semi - pliable non - skid platform 18 having flow - through apertures 7 to minimize shear forces while the user is doing standing exercises that entail the vertical displacement of the board through the water , as indicated by the arrows in fig5 a , or the horizontal displacement of the board through the water , as indicated by the arrows in fig5 b . this embodiment also has a rigid cover 19 , circular about its periphery and semi - circular in cross - section , and an inflatable , tube 20 , circular both about its periphery and in cross - section . the rigid cover 19 has an inner edge 21 , an outer edge 22 , an upper surface 23 and a lower surface 24 . inflatable tube 20 has a top surface 25 and a bottom surface 26 . both rigid cover 19 and inflatable tube 20 are disposed around the periphery of platform 18 , the inner edge 21 of rigid cover 19 being connected by conventional means to the periphery of platform 18 . the purpose of the rigid cover 19 is to maintain a connection between the platform 18 and the inflatable tube 20 . this connection may be accomplished by attachment of the top surface 25 of inflatable tube 20 either completely or partially to the bottom surface 24 of rigid cover 19 ( e . g ., by application therebetween of waterproof or water - resistant adhesive , complementary hook and eye attachment means attached to the lower surface 24 of rigid cover 19 and the upper surface 25 of inflatable tube 20 , etc .) or via conventional strap means that are looped through apertures 27 that may be disposed either along the inner edge 24 of rigid cover 19 or along outer edge 28 of platform 18 . these conventional strap means would encircle both inflatable tube 20 and rigid cover 19 in the cross - sectional direction . the inflatable tube 20 can be selectively inflated to allow for the adjustment of buoyancy . this is useful to accommodate humans of different weights , or to allow a user / exerciser to select variable resistance forces . this variability allows for a maximal training benefit and / or progressive rehabilitation for those who are injured or diseased and need to be carefully progressed from less to more resistance as their body becomes stronger . one can inflate the tube 20 by manually stepping on an air pump 29 , which then pushes air through an inflation tube 30 that attaches to the tube stem 32 . this system for inflation functions just as a typical bicycle pump . one can even use a bicycle pump to inflate the tube 20 . fig5 is a demonstrable representation of the functional usage of the embodiment of fig3 training board 12 . one can also kneel and place the hands , or various other portions of the body , with different positioning for support , on the platform 12 for stabilization and / or balance training . fig5 a is a demonstrable representation of the functional usage of the embodiment shown in fig1 and 3 . fig5 b is a demonstrable representation of training board 1 for water - walking and fig5 c represents use of training board 1 for seated exercise . the invention may be embodied in other specified forms without departing from the spirit or essential characteristics thereof . the present embodiments are therefore to be considered in all respects as illustrative and not restrictive , the scope of the invention being indicated by the appended claims rather than by the foregoing description , and all changes which come within the meaning and range or equivalency of the claims are therefore intended to be embraced therein .
a device designed for use on land solely as a rehabilitative balance board apparatus and in water as a rehabilitation and / or fitness apparatus . the invention may be used terrestrially as a proprioception board and aquatically as a kickboard , as a proprioception board , and / or as a general exercise board that provides added resistance and / or buoyancy for the exerciser .