 User-RMT interaction quality will be evaluated with video recordings of each set-up and exercise session. Specifically, usability measures will include: need for additional assistance setting-up or operating the RMT; number of attempts required by the subject to interact with a specific feature: time spent on specific elements during the session. Participant feedback will be elicited post-session using two scaled questionnaires: System Usability Scale SUSand Reflexion Usability Scale RUS. Findings from the study will guide software modifications needed prior to implementation of future clinical studies within the NMCSD population. 