Digitalized Exercise Fit Tool Intervention for Adolescents With Blood Cancer

The goal of this clinical trial is to learn if a digitalised Exercise Fit Tool (EFT)mobile application can promote physical activity in adolescents aged 12‐18 years who havecompleted treatment for hematologic cancer (e.g., leukaemia and lymphoma). The mainquestions it aims to answer are: 1. Is it feasible to conduct a larger randomised controlled trial of the digitalisedEFT intervention? 2. Does the digitalised EFT intervention improve physical activity levels, physicalactivity self‐efficacy, and quality of life at 6 months?Researchers will compare the digitalised EFT intervention group to a usual care group tosee if the mobile application can promote physical activity levels, physical activityself‐efficacy, and quality of life in adolescents with hematologic cancer.Participantswill: 1. Receive a 20‐minute educational session on how to use the mobile application 2. Use the mobile application to self‐assess their appropriate physical activity leveland exercise with a virtual coach 3. Complete questionnaires and wear an accelerometer at 1, 3, and 6 months afterenrollment 4. Attend a 20‐30‐minute individual interview at 6 months (intervention group only, 10participants)