A U shaped spring designed to accommodate a long resistance path, designed to provide for a large leg squeezing area so that large squeezing resistance may be applied without excessive inner leg pressure, designed to facilitate incremental and great increases of resistance and, designed to employ an
arm restraint so that initial movement through the first half of the
range of movement will be against substantial and beneficial resistance. The U shaped spring for strengthening the pubococeygeus
muscle when squeezed between the upper legs comprises: a resilient strip bent into and held in a U shape, said U shape having spaced opposite arms extending in a same direction, and a central portion connecting the opposite arms; and, an
arm restraint extending between the spaced opposite arms holding and preventing the arms from resiliently
springing apart beyond their spaced configuration. The
arm restraint is generally under a substantial tension load, and is unloaded only when the arms of the U shaped spring are squeezed together between the upper legs thereby strengthening the pubococeygeus
muscle. In a preferred aspect of this invention the strip comprises
sheet steel and the arm restraint comprises a
wire rope extending between and through holes in the opposite arms.