Cancer-related Fatigue and Its Biological Contributors in Adolescent and Young Adult Brain Tumor Survivors: Effects of a Tele-exercise Intervention

Inclusion Criteria: 1. Is currently between the ages of 18-39 years 2. Their primary brain tumor was diagnosed at age 15-39 years 3. Is 6 months to \<5 years post curative treatment 4. Has been treated with chemotherapy and radiation, given most patients receive both therapies. 5. Functional Assessment of Chronic Illness therapy (FACIT)-Fatigue ≤ 43. FACIT-Fatigue will be used as a screener because this 13-item scale can be completed relatively quickly in clinic 6. Currently engage in \<150 minutes of PA and \< 2 sessions of muscle strengthening exercise per week (assessed by Godin Leisure-Time PA Questionnaire) 7. Must be able to speak, write, and read English 8. No exercise contraindication as assessed by screening with the Physical Activity Readiness Questionnaire PAR-Q+. In addition, participants' care teams will be notified of their participation in the study. 9. Must be able to provide informed consent/assent. Exclusion Criteria: 1. Non-English speaking 2. Screen failure for exercise safety 3. Underlying unstable cardiac or pulmonary disease or symptomatic cardiac disease 4. Recent fracture or acute musculoskeletal injury that precludes ability to participate in supervised exercise training sessions 5. History of underlying chronic disease, secondary malignances, germline genetic syndrome, or recurrent disease requiring re-irradiation of the brain 6. Cognitive and/or major sensory deficits that would impede the completion of research activities and assessments as deemed by the clinical team. 7. Self-report of pregnancy 8. Prisoners 9. Documented developmental disorders (e.g., Autism) or major psychotic illness (e.g., schizophrenia)