Background: \- More children with cancer are surviving into adulthood. Some side effects from treatment go away quickly. But some problems may not go away or may only show up months or years later. These problems are called late effects. Late effects can cause difficulties in cognitive functions, such as attention and memory. Physical activity has been found to improve the attention and memory skills of children with Attention Deficit Hyperactivity Disorder (ADHD). Researchers want to see if physical activity can help with these cognitive problems in children with brain tumors. Objectives: \- To see if physical activity can improve cognitive functions in children who had radiation therapy for a brain tumor. Eligibility: \- Children ages 8 17 who had radiation for a brain tumor at least 2 years ago. They must have access to a computer. Design: * Participants will be screened with height, weight, and medical history. They will answer questions about daily physical activities. Their heart will be checked. * Participants will go to the clinic for 2 days. They will have a fitness exam and tests about attention, memory, and concentration. They will have blood taken and answer questions. Parents will also answer questions. * Participants will be put into 2 groups. For the first 12 weeks, the intervention group will follow a physical activity program. The control group will do their usual physical activities. * For the second 12 weeks, the control group will follow the physical activity program. The intervention group will continue the activities on their own. All groups will track their physical activity with an activity monitor and computer. * Participants will have a follow-up visit at the clinic after each session. They will repeat some of the tests listed above. * The study lasts 24 weeks plus the two follow-up visits. Participants can keep their activity monitor.
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Efficacy
Timeframe: 12 weeks