Hmmm been there done that
after being strapped to a 600 series '47 xmon most of every year, one year I spent the last few weeks of ten hour days strapped to a '47 900 series xmon.
my astute offspring noticed how slow I was to stand up straight at days end.
solution - at xmas we'll buy dad a vibrating seat cover for the motor car so that he can get fixed up while he drives us four days each way to the coast for holidays.
If I do say so myself, I'll not be volunteering as a test dummy for your new gadget
