Remember Dr. Octopus? These Shoulder-Mounted Robotic Arms developed by MIT remind us of his gear. Supernumerary Robotic Limbs are robotic limbs that allow you to do things that may be impossible to do without them.
These two additional arms have their reaction forces aligned with your spine. The whole system weighs only 10 lbs, so you can put the gear on without having to put too much pressure on your body. Just think about all the possibilities here.