Exercise and Pain in CCS

CCS will participate in a 16-week physical activity program. CCS will be instructed to start with a session duration of \<15-min, three days per week at low intensity (e.g., activities expending \>1.5 to 3 METs or intensity \<5 on a scale of 0 to 10). Any type of physical activity will be acceptable. The program will be individualized, and activity increased according to patients' health status, results from the physical function assessment, and most recent week's achieved physical activities. The program will include support calls and texts from research staff (exercise physiologist). The program will be modified and adapted during support calls or texts, including frequency, intensity, time and type to maximize CCS' success. CCS will receive a Fitbit at the beginning of the intervention.

CCS in the control group will not participate in a 16-week physical activity program and will not receive support calls or texts. Physical activity advice according to the Children's Oncology Group Guidelines for Diet and Physical Activity recommendations and the International Pediatric Oncology Exercise Guidelines will be offered to CCS following completion of 16-week follow-up. Moreover, CCS will receive a Fitbit following completion of 16-week follow-up