A server to perform a selected therapy on a user. The server may include a processor which may obtain activity information (AI) including information related to one or more of augmented-reality (AR) activity information, AR anatomical feature information, and range-of-motion (ROM) information； obtain user information including information related to one or more of the anatomy and physiology of the user； determine expected range-of-motion (EROM) information in accordance with the AI and the user information； track selected body parts (SBPs) of the user corresponding with the AR anatomical feature information； and/or render one or more augmented-reality limbs (ARLs) in relation with one or more corresponding SBPs of the user on a display of the system.
