This kind of belongs to halfbakery.com, but it is down now. (I found on archive.org that) hydraulic pump (like the kind used to lift cars) forces and the surface areas of the two ends works by the equation F1 = F2(A1/A2). Say you had a .025 m^2 (end 1) surface on one end of a hydraulic pump and a .0009 m^2 (end 2) (Just remember end 1 is much larger than end 2). On end 2 has the ability to run the length of say, .5-1 meter in a pipe (when end 1 is compressed) and there is a strong magnet on the surface end 2. At the end of this pipe is a copper section to facilitate eddy currents when end 1 is compressed and causes end 2 to volley the magnet up the pipe and the copper section of the pipe. End 1 is attached to your foot so that when you walked or ran your body weight compressed end 1, and end 2 and its pipe is securely ligatured to your back, so that any change in momentum is not expressed in the pipe independently of the you, the wearer (the pipe is strapped on really tight). End 1 and end 2 are connected by a steel-braided tube or something pressure restrictive. What I want to do with this is to generate an upward force from the forces of running. I have seen/heard that running exerts a force of up to three times your body weight. This force could be exerted on end 1 and the subsequent result would be force upwards on your body, because end 2 would be displaced very much and volley the magnet into the copper section. What do yall think? Here are some factors that would inhibit the functionality of this design that I can think of right now: -weight of the apparatus and the magnitude of force generated by the eddy current reaction -viscosity of the hydraulic fluid (would it facilitate near-instantaneous movement of the ends in when the force of running is applied?) -will a smaller-diameter tube (relative to the diameters of both the ends' surfaces) connecting the two ends allow the appropriate/classic/formulaic (in first paragraph) translation of forces between the two ends (I think it would)? I just want to see if the idea would work. thanks.