Exercise and Lifestyle in Adolescent Cancer (HEALTHYADOL)

"the intervention group will follow a physical exercise and health counselling intervention--see below.~The exercise program will be performed in the hospital gymnasium (3 supervised sessions/week of aerobic and muscle strength exercises) or in the patients' room (during phases of treatment-induced immunodepression, where isolation is needed to prevent infections). It will also include specific training of the respiratory ('inspiratory') muscles (e.g., diaphragm) on 5 days/week. The counselling program will include psychological (once weekly), nutritional (twice monthly), support (with survivors of adolescent cancer, twice/month) and educational (for relatives/caregivers, once monthly) sessions."