referring to fig1 - 3 of the drawings , the exercise device 10 of the invention can be seen having a ring platform 11 with a main body member 12 defining an outer annular perimeter edge 13 and an oppositely disposed ball engagement interior annular edge 14 . the ring platform 11 has a generally flat top surface 15 and correspondingly oppositely disposed flat bottom surface 16 in its preferred form chosen for illustration in this example . the ring platform 11 has a plurality of contoured band retaining slots 17 extending inwardly from its outer perimeter edge 13 as best seen in fig3 of the drawings . the retainment slots 17 are in spaced annular relation to one another extending thereabout . each of the contoured retaining slots 17 have a spaced parallel sidewalls 17 a and 17 b extending inwardly from the perimeter edge 13 with respective round corners 18 . the sidewalls 17 a and 17 b terminate and are intersected by an annular bore 19 extending through the ring platform 11 and is of a diameter greater than that of the spacing of the hereinbefore described retainment slots 17 . it will be seen that the contoured retainment slots 17 is therefore of a keyhole configuration which will provide for band adjustable retainment as will be described hereinafter . the ring platform 11 is of an interior open diameter less than that of the diameter of a fitness ball 20 on which it is frictionally positioned for use as seen in fig1 and 2 of the drawings . referring now to fig1 and 5 of the drawings , an exercise stretch band assembly 21 can be seen having an elongated cross sectional solid band 22 of resilient synthetic resin material well known within the art . the band 22 has a handgrip 23 attached to one end thereof . the handgrip 23 has a rigid gripping rod 24 with connector straps 23 a and 23 b extending from its oppositely disposed respective ends to a molded band attachment fitting 25 as best seen in fig4 of the drawings . the elongated band 22 has a plurality of longitudinally spaced enlarged retainment ring engagement fittings 26 formed integrally there along . each of the ring engagement fittings 26 is of a foreshortened fusto - conical configuration defining a base dimension of an annular diameter greater than that of the cross section of the band 22 on which it is formed as best seen in fig5 of the drawings . the exercise band assembly 21 can therefore be selectively engaged and retained within the respective contoured retainment slots 17 in the angular ring platform 11 by engagement of the correspondingly selected ring engagement fittings 25 thereon effectively varying the overall length of each of the bands 22 as may be required during use as seen , for example , in fig1 of the drawings . this length adjustment factor is also dependent on the size of the fitness ball 20 which varies within the art . it will be evident that given the material nature of the stretch band 22 which are similar to a known typical rubber band having unique characteristics of elastic deformation . as such , it will be seen that expediential input force is required to effectively increase the length of the elastic material and the band 22 . a variety of different exercises may be achieved utilized by the repositioning of the stretch bands 22 to a different contoured retainment slot 17 positional registration about the ring platform 11 and the band length determined by the selective engagement of the stretch band ring engagement fittings 26 in combination , as required , with the user &# 39 ; s orientation on the exercise ball 20 . other variations in band constructional configurations can be achieved to impart additional elongation forced determination by the effective diameter of the basic band 22 and the selection of material , again well within the confines and understandings of those skilled within the art . referring now to fig7 of the drawings , a modified exercise device 27 can be seen in which an effective balancing platform 28 is configured on a half spherical exercise ball 29 forming a ground engagement support . in this example , the hereinbefore described ring platform 11 may also be used and engageable on the half exercise ball 28 as hereinbefore described . accordingly , the exercise band assembly 21 is in this example adjustably engaged within the ring platform contoured slot 17 as before providing multiple use placement and effective length to accommodate the user u during use . again , in this example , the user stands balancing on the platform 28 holding onto the oppositely disposed handgrips 23 of the resiliently positioned and selectively arranged bands 22 as previously described providing a unique and novel exercising opportunity utilizing essentially the same basic elements as the preferred form of the invention as described in the exercise device 10 previously . it will thus be seen that a new and novel multiple resistant stretch band ring for fitness balls and the like has been illustrated and described and that various changes and modifications may be made thereto without departing from the spirit of the invention , therefore i claim :
an exercise apparatus having a resilient band attachment assembly for use with an exercise ball . an exercise ball engagement ring provides multiple attachment points for resilient bands selectively and adjustably secured thereto . during use , a user rests a portion of their body on the exercise ball while pulling the resistant straps elongating same for varied resistance depending on strap length , diameter and attachment point within the ball engagement ring .