healthy office chair design

It is a very well known fact that those who have a job that needs them to sit long hours makes the men and women accumulate huge quantities of belly fat.

I am not sure why the technology or science has not made it inventive enough to design ergonomic and health friendly chairs for such people. Or maybe I have not come across any such chairs, or maybe such chairs cost a bomb!!!

I for one have been toying with the idea of designing an exercise chair that actually is an office chair but with sufficient contraptions that can be hooked onto the human body sitting on it, to use the human body motion to generate energy.

I have tried to search the net for any such design but have not come across any yet. Not sure if these are not published or have not been patented yet to be known publicly. The chair I thought of as a design actually gets it's benefit from the human subconscious habit of shaking the legs when one is sitting.

This habit can be used very effectively to generate power that probably will be as little as a few milliwatts, but if stored effectively can be used to say, charge your phone, or run a fan for temporary relief.

Given that the idea is to use the human energy generated while shaking ones legs, the chair should also have pedals that get used giving the legs and lower body sufficient exercise - all of this happening while one is sitting and working.

The focus on work will probably not be impacted as much since the leg shaking or pedalling will happen when the individual is idling in thought process or is deep in the thought process during which time, the frequency of shaking ones legs increases.

The issues in this design is that the material to be used should be very light, maybe carbon fiber like the ones used in racing cycles, and the mechanism to convert the motion/kinetic energy into any form of potential/electromechanical energy should itself be efficient and smooth. I believe any seating of this sort can eventually be designed to wedge into the cubicle structure in such a way that multiple people sitting around, when begin to shake their legs, can generate more power that can be tapped.

Psychologically, this could also cater to a play like atmosphere at work whereby people can get together for leg shaking/pedalling during short breaks and thereby release some of their internal tension that could come up while working - team play, subtle exercise, eco friendly power generation, and work - all at one place...

what else can be more relaxing? Maybe there are some more aspects yet to be thought about, or some more disadvantages which will rule this idea out.... but maybe I should go ahead and patent this idea if someone can help me with the process??? :-)