Mobile electroencephalography (EEG) and magnetoencephalography (MEG) technology have the potential to revolutionize the study of motor expertise by providing real-time brain activity data in a non-invasive and portable manner. In the context of sports, these recording techniques have already been used in various applications such as mental fatigue monitoring, concussion assessment, and even talent identification. Here, we discuss the potential for mobile technology to facilitate precise characterization of brain dynamics, and outline a number of challenges for the use of portable technology in this context. Specifically, we argue that mobile brain recordings cannot only improve our understanding of motor activities, athletic performance, and athletes' individual differences, but also provide an opportunity for researchers to exploit the richness and uniqueness of sports environments as a tool to better understand the brain. We close with a discussion of the promise of this body of work for future research in sports and exercise neuroscience.