generation of an electric signal corresponding to a deformation of the pre stressed leaf it should be emphasized that the claimed device of the present invention is designed for attaching to standard bicyclical articles and no improvement or modification of the bicyclical articles is needed according to some embodiments of the present invention there is a provided an applied force sensing device method and system for people who take interest in their performance during athletic activity which device and or method and or system may be described in view of fig1 7 a primary function of the invention is to provide the means to improve the ease of installation of applied force sensing devices while assuring continuous precise measurements over time in an exercise environment by allowing users to tightly attach the device to a measured object in a manner which creates constant pressure ensuring the consecutiveness of contact required for sensitive and precise measuring according to some embodiments of the present invention the device may be shaped as a case hosting electronic components 2 made of resilient material such as metal or plastic shell according to some embodiments of the present invention the device may include at least one applied force sensor such as a strain gage 5 cased in the shell 2 and provided with a spring loaded leaf 4 for measuring the force applied to an exercise object according to some embodiments of the present invention a spring loaded u2018 leaf u2019 4 is firmly connected to a measured object accordingly the spring loaded u2018 leaf u2019 4 may indicate the strain force applied to the object part crank arm pedal 100 to be measured by the strain.