Personalized exercise program shows promise for reducing fatigue in children with cancer

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion criteria: * First/initial diagnosis of a primary oncologic disease according to the International Classification of Childhood Cancer (ICCC), requiring chemotherapy and/or radiation therapy or First/initial diagnosis of a relapsed oncologic disease according to the International Classification of Childhood Cancer (ICCC), requiring chemotherapy and/or radiation therapy or First/initial diagnosis of a secondary oncologic disease according to the International Classification of Childhood Cancer (ICCC), requiring chemotherapy and/or radiation therapy * Planned or started anti-cancer treatment (chemo- and/or radiotherapy) at one of the recruiting centres of the FORTEe trial * The patient is assessed by the treating team (pediatric oncologist, exercise professional etc.) as suitable to participate in the trial, e.g. due to medical or psychological reasons. * Existing informed consent (or assent) to participate in the study * The patient (and the legal guardian) has/have sufficient knowledge of the respective national or English language so that it is possible to carry out the informed consent as well as interviews (in age-appropriate language). * The patient is not in a terminal phase of the disease. Exclusion criteria: * Oncologic disease (primary/relapsed/secondary) according to the International Classification of Childhood Cancer (ICCC), requiring neither chemotherapy nor radiation therapy or solely requiring surgery * Reasons that already exist or are foreseeable at the time of study enrolment, due to which the patient will not have access to the exercise intervention and/or to the pre-test and/or to the post-test (e.g. foreseeable or planned, permanent change of treatment centre) * The patient is assessed by the treating team (pediatric oncologist, exercise professional etc.) as unsuitable to participate in the trial, e.g. due to medical or psychological reasons. * After detailed information and, if necessary, having time to consider, the patient (≥ 16 years of age) did not agree to give written informed consent to participate in the trial. * The patient (and the legal guardians) has/have insufficient knowledge of the respective national or English language, so that it is not possible to carry out both the informed consent and interviews (in age-appropriate language). * The patient is in a terminal phase of the disease