Inclusion Criteria:  Lymphoma patients post-treatment (except ongoing adjuvant treatment) Post-treatment period not exceeding 3 months Internet connection at home Literacy with information and communication technology Patients who agreed with informed consent  Exclusion Criteria:  Inability to perform a cardiopulmonary exercise test Psychological severe or cognitive disorders Contraindications for cardiopulmonary exercise testing Other exercise limitations (musculoskeletal disorders) Planned intervention or operation Participants who are enrolled in or participate in other rehabilitation program Participants who plan to be or are included in other studies