Long-term adherence to a Home Exercise Programme (HEP) is a difficult task for many athletes after an Anterior Cruciate Ligament Reconstruction (ACLR), making it difficult to go back to play sports. There are some common barriers that contribute to the tendency of patients not continuing with their HEP, like fear of re-injury, boredom, and lack of expectations. In my PhD research, I am using a user-centered approach to determine design guidelines for an immersive VR application for physical therapy, focused on ACL injuries. After identifying the needs of the users, cozy gaming characteristics have been chosen in order to design this application. Initial literature review and feedback has shown that a relaxing and task-oriented game could increase engagement on the prescribed exercises.