Inclusion Criteria:  Survivors of Hodgkin and aggressive non-Hodgkin lymphoma Not indolent non-Hodgkin lymphoma Not CNS lymphoma at diagnosis Not relapse or second cancer Not ongoing cancer treatment Chronic fatigue measured by Chalder Fatigue Questionnaire Diagnosed 2012-2020 Curatively treated 18 - 70 years old at inclusion > 2 years since last treatment Participation approval from oncologist in the project group  Exclusion Criteria:  Persisting fatigue > 1 year before the cancer diagnosis Somatic/physical conditions (i.e. severe heart failure/disease, lung disease, use of wheelchair /crutches) Psychiatric or mental disorders (i.e. dementia, severe depression, schizophrenia) Use of stimulants for ADHD Substance abuse disorder