This paper elucidates the work done using highly efficient graphene fibers and related composites for human activities monitoring applications. It explains how the graphene fibers have been fabricated and implemented for various activity monitoring purposes. The significances of graphene fibers lie in their exceptional mechanical and functional performances for sensing applications. These materials have been developed by processing a range of carbon-based allotropes like graphite and liquid crystals. These fibers are used in their pure and composite forms to develop a range of sensing prototypes, both invasive and non-invasive, thus playing a pivotal role in their chosen applications. The operating mechanisms of these graphene fiber-based sensors were based on electrochemical, strain and electrical sensing, where the minuscule changes in the input analyte were detected with high efficiency. The paper highlights some of the challenges existing with the current GFs-based sensors. It also showcases a market survey to estimate the increase in graphene fibers' usage to develop prototypes for different sensing applications.