at a 90 degree angle relative to the first end 162 is configured to detachably engage with the removable trampoline extrusion 24 provided on the inner trampoline ring assembly 14 as described above thus like sports activity device 10 the inner ring assembly 14 of sports activity device 100 detachably engages with its aforesaid outer ring member 112 having thus described the invention with particular reference to illustrated embodiments hereof it is to be appreciated that various changes and modifications can be made therein without departing from the spirit and scope of the present invention as defined by the appended claims for example the elastic planar surface 28 can additionally serve a promotional or advertising purpose by allowing for graphic branding or imprinting additionally a more heavy duty elastic membrane may be used for the planar surface 28 thereby allowing it to be used as an athletic training aid used in conjunction with an exercise u201c heavy ball u201d the invention would aid in organized training sessions geared towards building core strength and coordination across ages ranging from child to senior furthermore the aforesaid sports activity device 10 of the invention can be made in a variety of sizes and materials that would extend the occasions and environments in which it can be used for example smaller softer versions may be used indoors with softer and lighter balls or objects larger more rigid versions may be provided which would require greater strength and would rebound balls and other objects to greater distances and velocities heavy duty versions that would utilize cover materials for the elastic planar surface 28 having textures and reliefs allowing for more positive handgrip and resistance to abrasion it is further to be appreciated that the aforesaid.