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The investigation of the magnetic flux signals of muscles, magnetomyography (MMG), was already described in the 1970s, but hardly pursued due to the lack of spatial flexibility of SQUID systems. In recent yaers compact optically pumped magnetometers (OPMs) have been brought to market that are capable to measure the tiny biomagnetic signals almost as SQUIDs, while being flexible just as electrodes. First explorative experiments indicate the potential for MMG that comes along with OPMs. By enabling MMG to be used as a novel method in medicine and sports science they herald a renaissance for MMG. But this also requires further development of the sensors as well as a deeper understanding of the spatial and temporal magnetic field structure. Thus, it is necessary to understand the magnetic flux signal starting from the smallest unit of a muscle signal - the muscle action potential (MAP) of a single muscular fiber - and then venture into its complex summation. This work summarizes the current state of the several sequential experiments that demonstrate the possibilities and limitations of MMG using OPMs. We indicate how OPM might be a valuable complement to conventional electrophysiology in the future. [ABSTRACT FROM AUTHOR]