Video game-based training programs, in the following referred to as exergames are an innovative digital training approach to simultaneously train physical and cognitive functions and increase training motivation for various populations. Patients who are differently limited in their physical and cognitive performance due to a decline in functioning can profit from a motivating and combined physical-cognitive training approach. An interdisciplinary team of movement scientists, sports and training experts, as well as game and industrial designers developed an innovative and immersive video game-based training product for patients - the ExerCube training software licence. The exergame development focused on a user-centred process together with the target population. The ExerCube training software licence is an exergame training product that includes immersive mixed-reality training programs (or video games) for patients. Depending on the patient's training requirements, the therapists can choose from the training program repertoire. The patients control the training program (or video game) by specific (whole) body movements. To present the virtual training programs from the ExerCube training software licence in the physical environment, the ExerCube hardware and harness system is used to serve as a physical training room. It allows the virtual video game environment to be presented in the physical world. This summative usability study aims to assess the training system's safety, usability and validate the user experience. Primary end-users (defined as patients aged 18 and above) and secondary end-users (defined as sports scientists, training therapists or physiotherapists/occupational therapists with a focus on sports/training therapy) will test and review the system in different testing scenarios.