This study focuses on the use of virtual reality-assisted exercise in children. Specifically, it targets patients undergoing hematopoietic stem cell transplantation (HSCT). Relevant conditions include pediatric physiotherapy, pulmonary rehabilitation, and general physiotherapy and rehabilitation in cancer patients. The main intervention involves exercise training, which may or may not be combined with medication. The probable aim is to improve rehabilitation and outcomes in pediatric patients after HSCT. The study was sponsored by Istinye University and the Health Institutes of Turkey. The project has already been completed.