Inclusion Criteria:  Aged 18 years and over MDT outcome of proven or high clinical suspicion of colorectal cancer Due to undergo either laparoscopic, robotic or open resection with curative intent Ability to exercise on a static bike (in order to complete the CPET, not required for the exercise programme) Ability to give informed consent Must be able to their organize own transport to RDH for the duration of the study in order to complete the supervised exercise sessions Availability for the period of study inclusion  Exclusion Criteria:  Participants who lack capacity to consent Participants with a new diagnosis undergoing emergency surgery  Participants with a past medical history including the following:  Recent myocardial infarction (MI) in the last 6 months or unstable angina Heart failure (New York Heart Association Class III/IV) Uncontrolled hypertension (BP>160/100) Previous stroke/TIA Cerebral or abdominal aortic aneurysm Severe respiratory disease including known pulmonary hypertension (>25mmHg) Exercise induced asthma or brittle asthma Abnormal blood and/or ECG results Patients who are unable to undergo CPET according to the Perioperative Exercise Testing and Training Society (POETTS) published consensus guidelines on performing CPET