Game-Based Physical Activity in Childhood Cancer Survivors

Inclusion Criteria: Childhood cancer survivor: * History of treatment for childhood cancer with cardiotoxic therapy (anthracyclines, chest radiation, total body irradiation) * Off all systemic cancer therapy for ≥ 2 years * Ability to speak and understand English * Ability to complete all protocol assessments * Mobile device with SMS text messaging capability * Ambulatory and able to perform all study requirements * Attained age 10-16 years * Has a parent or legal guardian willing to participate in the study as a dyad * Willing to receive daily SMS text message alerts * Not currently exercising at least 30 minutes per day (5 days/week) * ECOG Performance Status of 0-1 Parent/legal guardian: * Parent or legal guardian of a childhood cancer survivor treated with cardiotoxic therapy (anthracyclines, chest radiation, total body irradiation) * Parent or legal guardian of a child age 10-16 years who is at least 2 years from completion of systemic cancer therapy * Ability to speak and understand English * Ability to complete all protocol assessments * Ability to provide informed consent * Ambulatory and able to perform all study requirements * Access to a mobile device with SMS text messaging capability * Is the parent or legal guardian of a childhood cancer survivor who is willing to participate in this study as a dyad * Willing to receive daily SMS text message alerts * ECOG Performance Status of 0-1 Exclusion Criteria: * Survivors, or parents/legal guardians of survivors, with a medical condition that makes it unsafe to complete study requirements are not eligible for this study. This includes a diagnosis of: * Severe persistent asthma * Known symptomatic coronary artery disease * Musculoskeletal defects that interfere with sustained physical activity * Any medical or psychosocial condition that, in the opinion of the investigator, would jeopardize the health of the participant during study procedures