Prehabilitation revolves around three axes: 1) a physical training based on initial cardiopulmonary exercise testing (VO2peak, anaerobic threshold (AT) and 6-min walk test (6MWT)), 3 times by week, supervised by a physical therapist 2) a nutritional care to ensure the compliance of the nutrition program and adapt the nutritional management based on protein and energy needs and on the level of spontaneous oral intake and 2) a psychological treatment by a psychologist to reduce preoperative anxiety. To our knowledge, no study ever focused on the gastroesophageal cancer. The benefit of prehabilitation in this cancer may be particularly important because 1) this surgery is associated with a high postoperative morbidity (40%, especially respiratory) and mortality (5%) 2) the physical and nutritional status of these patients is often precarious (cancer cachexia, gastroesophageal obstruction), and 3) the need to preoperative chemotherapy declines physical reserves and is associated with a lengthening of the time between consultation and surgery of more than 3 months (10). Also, the investigators hypothesize that with a physical training, a personalized nutritional support and a psychologist management may decrease postoperative complications, increase postoperative nutritional status and so, would allow for more patients to receive their full cancer treatment. The aim of this study was to evaluate, in gastroesophageal adenocarcinoma, the effect of prehabilitation compared to conventional care, the percentage of patients reaching the complete oncological treatment decided in a multidisciplinary tumour board.