Motion for Recovery: The Impact of Gyrokinesis on Childhood Cancer-Related Fatigue.

Inclusion Criteria: * Diagnosed and treated for a brain tumor during childhood or adolescence (0-≤18 years). * Treated for a PBT during the previous 10 years, starting from date of diagnosis. * Aged ≥6 years 0 months at the start of the trial. * Off therapy/active treatment for pediatric brain tumor (PBT) for 12 months at the start of the trial. * No known signs of clinical or radiological tumor progression at last follow-up. * Danish is the sole or primary language (enabling provision of validated assessment tools). * Patient and family have provided consent for inclusion in the trial. Exclusion Criteria: * History of recent poorly controlled seizures. * Motor tics or Tourette syndrome (including family history of tic disorder). * Known diagnosis of Attention Deficit/Hyperactivity Disorder or Autism Spectrum Disorder. * Known diagnosis of Full Scale Intelligence Quotient (FSIQ) of \<50. * Pregnancy. Participants known to be pregnant or breastfeeding at screening/registration will not enrolled