RecruitingBehavioural interventionThe Impact of PReOPerative Exercise and NutritionaL Optimization on Perioperative Outcomes for Patients Undergoing Treatment for Rectal Cancer: The PROPEL TrialThe purpose of this study is to determine the feasibility of a prehabilitation program for participants diagnosed with rectal cancer undergoing neoadjuvant chemotherapy and/or radiation, followed by surgical resection. The names of the groups in this research study are: * Group A: Prehabilitation program * Group B: Usual Care