Are you certain that you need the 1kg-100kg range? A person’s weight is distributed over a fairly large area within the shoe, relative to the sensor area. Of course the force will change dramatically during the stride or activity, but the force sensor will only measure whatever portion is actually applied to the sensing area. Use a small diameter sensor to intercept a small fraction of the total. This one measures up to about 40 kg applied to a 9.5 mm diameter sensing area https://www.sparkfun.com/products/8685