Jari means constant movement. It is impossible to actually sit on a Jari Activstool, no lying back, no slouching and definitely no sitting still. With a rotating convex base, Jari forms one leg of a stable tripod, your own legs provide the other two parts. That means you are constantly flexing, adjusting and moving; the ideal way to stay focussed and concentrate. But the coolest thing about Jari Activstool is that it is gas height adjustable. That means it fits a huge range of applications