Today’s invention is a posture improver for those of us who spend a lot of time seated at a desk.
When seated, a person would wear an inflatable vest attached to the back of an office chair so that it can move vertically.
This is tied to a helium-filled balloon (orange).
The buoyancy force, acting to straighten the wearer’s back, would be the weight of about 3kg (this could easily be supplied by a weight strung over a pulley, but the balloon is more fun, and advertises the need for better posture).
In addition to an improvement in posture, this system lightens the load on one’s backside, which is now known to be life shortening, if you sit still for hours at a stretch.