... can be seen in the video, a thin-film force sensor. It changes its resistance when force is applied. Directly above it are two cylindrical, interlocking polymers: the inner polymer is a conductive foam that changes its resistance when compressed. The outer polymer surrounding the foam is responsible for the spring and cushioning properties of the sports shoe. With each step, a piston transfers the force from the foot to the foam and cushioning polymer. The conductive foam is compressed along the vertical axis with each step and makes it possible to calculate the acting force via the changed resistance. The result is a movement profile of the runner. The suspension in the heel can be ...