The primary aim of this randomized, controlled study is to evaluate the impact and feasibility of a prolonged physical activity intervention in school-aged childhood cancer survivors who self-report sedentary lifestyles. The study will test the hypothesis that childhood cancer survivors participating in a physical activity intervention guided by Social Cognitive Theory will increase the amount of time spent daily in moderate to vigorous physical activity, and improve exercise self-efficacy compared to children randomized to usual care. A secondary aim is to assess the impact of the intervention on cardiovascular risk factors including fitness and body composition.

Inclusion Criteria:

1. Cancer survivors ages 8-12 years.
2. Off therapy for at least 3 months and not more than 5 years and in remission.
3. Medical clearance to participate in physical activities from the survivor's primary oncology provider;
4. Self-report of < 60 minutes of moderate to vigorous physical activity (MVPA) per day.
5. Must be able to ambulate.
6. Signed informed consent/assent.

Exclusion Criteria:

None