A portable isometric exercise device, comprising:
- a. a body that defines a first interior chamber in one area and a second interior chamber in an adjacent area;
- b. a coil resistance spring having a top end and bottom end housed in the first chamber and retaining a “U” shaped spring force selection member having an arcuate lower section which extends below the bottom end of the coil spring and a first longitudinal bar adjacent the top of the coil spring and terminating in a first transverse retaining member and a second longitudinal bar terminating in a transverse force selection member adjacent the top of the coil spring and extending in a direction opposite to the first transverse member;
- c. an isometric spring force selector retained within the second chamber of the body having an interior slot extending through a longitudinal opening in a wall facing the coil spring, a multiplicity of paired force selection resistance level openings positioned in an aligned column on the spring force selector, the body having aligned matching openings;
- d. the force selection member positioned within the slot of the isometric spring force selector so that the bottom of the “U” shaped spring force selection member can be pulled to cause the transverse force selection member to be aligned with a given pair of openings;
- e. an electronic signal indicator having two metal prongs which extend from a body of the indicator which contains an electronic signal means therein, so that when the two metal prongs are inserted into a respective one of the pair of openings, the prongs come in contact with the transverse force selection member to close an electric circuit and cause a signal to be continuously emitted and when the two metal prongs lose contact with the transverse force selection member the signal is terminated;
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- f. a first gripping means connected to the arcuate lower section of the “U” shaped spring force selection member and a second gripping means affixed to the body at a location remote from the first gripping means, wherein when the first and second gripping means are pulled apart the transverse force selection member comes in contact with the selected location where the two metal prongs are located and a continuous signal is emitted to advise that the given level of isometric resistance force is achieved and maintained and if the force is reduced, the transverse force selection member move away from the prongs and the signal is terminated.