Study on Fatigue in Colorectal Cancer Survivors, a Lifestyle Intervention

Inclusion Criteria: * Aged 18 or above. * Completed curative stage I-III colorectal cancer treatment in the previous 6 months to 5 years. * Live on a reasonable distance from the research center at the Wageningen University \& Research (WUR) (i.e. maximum of ± 1 hour away). * Classified as suffering from CRF through the Functional Assessment of Chronic Illness Therapy (FACIT) - Fatigue Scale questionnaire with cut-off score below 34 indicating fatigue. * Willingness to be randomized into either the intervention or wait-list control group. * Willing and able to follow the lifestyle intervention. * Able to understand and provide informed consent in Dutch. Exclusion Criteria: * Planning to participate or participating in another medical research that could possibly interfere with the study results. * Excessive alcohol consumption (i.e. more than 4 glasses per day). * Chronic drug use and unwillingly to stop using drugs. * Unable/unwilling to comply with the intervention (e.g. through dementia, Alzheimer or mental illness)