(DE4105624-A)      The portable muscle building and exercising apparatus, has a helical compression coil spring (4), installed in a housing, has associated therewith appts. for indicating when a predetermined degree of compression has been attained. The component which actually stresses the spring is a tensioning member (5) having a conductive extension (6) which can complete the circuit of a plug-shaped acoustic alarm (9) when the spring stores a select amount of energy.    The alarm can be moved to any one of a number of different positions in the path of movement of the extension of the tensioning member. The audible signal which is generated by the alarm indicates to the user that the selected degree of stress upon the spring has been reached as well as that such stress is maintained. The apparatus is preferably actuated by the user pulling on a pair of handles attached to a flexible belt (3).    (US5141481-A)      A helical compression coil spring is installed in a housing and can be stressed to different degrees by three loop-shaped handles, two of which are to be held and pulled by the two hands, and the third of which can be engaged and pulled by one or both feet of the user or fixed to a stationary part. The component which actually stresses the spring is a tensioning member having a conductive extension which can complete the circuit of a plug-shaped acoustic alarm when the spring stores a select amount of energy.    The alarm can be moved to any one of a number of different positions in the path of movement of the extension of the tensioning member. The audible signal which is generated by the alarm indicates to the user that the selected degree of stress upon the spring has been reached as well as that such stress is maintained.    USE -   A portable muscle building and exercising device.    (FR2682879-A1)      The portable muscle building and exercising apparatus, has a helical compression coil spring (4) installed in a housing, associated therewith appts. for indicating when a predetermined degree of compression has been attained. The component which actually stresses the spring is a tensioning member (5) having a conductive extension (6) which can complete the circuit of a plug-shaped acoustic alarm (9) when the spring stores a select amount of energy.    The alarm can be moved to any one of a number of different positions in the path of movement of the extension of the tensioning member. The audible signal which is generated by the alarm indicates to the user that the selected degree of stress upon the spring has been reached as well as that such stress is maintained. The apparatus is pref. actuated by the user pulling on a pair of handles attached to a flexible belt (3).    (DE4105624-C2)      The portable muscle building and exercising apparatus, has a helical compression coil spring (4) installed in a housing, associated therewith appts. for indicating when a predetermined degree of compression has been attained. The component which actually stresses the spring is a tensioning member (5) having a conductive extension (6) which can complete the circuit of a plug-shaped acoustic alarm (9) when the spring stores a select amount of energy.    The alarm can be moved to any one of a number of different positions in the path of movement of the extension of the tensioning member. The audible signal which is generated by the alarm indicates to the user that the selected degree of stress upon the spring has been reached as well as that such stress is maintained. The apparatus is pref. actuated by the user pulling on a pair of handles attached to a flexible belt (3).