304 threaded mounting piece 305 bladder attachment piece 306 and inflatable bladder 307 note that in this view no fill mechanism is provided for inflatable bladder 307 element 308 represents hardware provided in the footrest 203 that can serve to provide an insignia or label however element 308 could be replaced with a fill mechanism or bladder filling hardware or such hardware could be provided elsewhere on the seating device 300 seat 201 attaches to seat mounting hardware 303 which is fixedly mounted atop inner post piece 301 inner post piece 301 slides within outer post piece 302 and is affixed at a desired height using tightening ring 304 the bottom of outer post piece 302 is threaded in order to engage threaded mounting piece 305 any type of threading may be employed or other securing means such as pins bolts and so forth may be used to secure the post 202 to the footrest 203 as shown threaded mounting piece 305 includes openings to bolt the piece to bladder attachment piece 306 bladder attachment piece 306 includes various holes for connection of the inflatable bladder 307 to the bladder attachment piece 306 shield or guard 204 is attached to footrest 203 using conventional means and keeps the user from tipping excessively fig4 illustrates an underside view of the second embodiment in perspective view footrest 203 has shield or guard 204 positioned therein and inflatable bladed 307 is attached to bladder attachment piece 306 dimensions of this fig4 embodiment are of particular note in seating device 400 inflatable bladder 307 is typically a portion of a sphere but other shapes may be employed to keep the user from excessively tipping.