Seven lymphoma survivors will be included, with the same inclusion criteria as in the planned RCT:  Inclusion Criteria:  Survivors of Hodgkin and aggressive non-Hodgkin lymphoma, diagnosed 2014 or 2019 (n=7) 18-65 years at diagnosis, and 19-67 years at participation. CF measured by Chalder FQ. Curatively treated, more than 2 years since last treatment. Participation approval from oncologist.  Exclusion Criteria:  Indolent non-Hodgkin lymphoma. Fatigue more than one year before the cancer diagnosis. Ongoing cancer treatment, relapse or second cancer, somatic/physical conditions (i.e. severe heart failure/disease, lung disease, use of wheelchair /crutches). Psychiatric disorders (i.e. severe depression, schizophrenia), substance abuse disorder.  In addition, eight cancer survivors with various diagnosis, will be included from a waiting list for rehabilitation at the Cancer Rehabilitation Centre at Aker hospital.